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Old 09-10-2002, 04:16 PM   #1
subarud
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Talking Bosal Downpipe from Rallispec

Recently, I ordered the Bosal Downpipe from Rallispec. Here are my thoughts on the pipe....

Before I installed the Bosal DP I was running a Vishnu Uppipe, Stromung 3rd Cat Eliminator, Straight pipe (no muffler), Samco IC hoses, and an MBC. Boost came on early and maintained pretty well until redline. Well, I thought that setup was good until I added this piece...

OMG, the first thing I said after the install ) was ďGod damn listen to these soundsĒ. Iím not joking, the noises/sounds/music that this dp makes are incredible. The twin dump design is what definitely makes this a winner in my eyes. Sounds like a really quiet BOV every time you get on the throttle or let off. The thing just sounds wicked.

The install was easy, it took me 1.5 hours as this was my first time and I work slow. All the bolts and flanges lined up perfectly except for one where there was too much weld and the nut didnít screw on all the way. But everything else was snug. Also, it included new gaskets which is a nice little addition. The heatshield was kind of a pain in the ass. Mine is all hacked up from an uppipe install and I didnít feel like cutting it anymore for this twin dump design so Iím going to fabricate my own with a metal sheet. I hooked my stock muffler back up because I really donít want to shoot flames and being loud isnít always a good thing, especially in CA!

The bosal downpipe definitely helped the spoolup on my stock turbo (Iíd say 300 rpms?!). It just feels more eager to rev and maintain boost. When I mash the throttle I am almost instantly on boost

Considering the price, $260 shipped you canít go wrong. I am thinking of removing the stromung 3rd cat eliminator because I want to be eco friendly and use it for track days. No one (vendor/manufacturer that I am aware of) offers this design in a downpipe with the option of running the 3rd cat section.

I would definitely recommend this piece even if there were no gains to be had with it (which there definitely are) because the sounds that emanate from the turbo area are just inebriating! Sorry I don't have pics but you can sure ask me any questions that come to mind.

Oh and if you donít like the sounds it makes, check your pulse!

~Evan
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Old 09-11-2002, 09:45 PM   #2
scottm1978
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the turbo opening is 2" and the dump is .5" correct?
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Old 09-11-2002, 11:44 PM   #3
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As stated by the vendor, the turbo outlet is 2.5" and the wastegate 1"
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Old 09-12-2002, 04:45 AM   #4
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nice, i definitely need to consider this one...
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Old 09-12-2002, 10:06 AM   #5
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Quote:
Originally posted by AutoXr
As stated by the vendor, the turbo outlet is 2.5" and the wastegate 1"

Thank you.


So up to what HP would you say this pipe is good for?

My goal is to hit 300 to 350 at the wheels. So will this pipe do?

I only whant to buy parts for my car once.
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Old 09-13-2002, 12:26 AM   #6
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Any chance of passing the sniffer test with only the 3rd cat left over?
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Old 09-13-2002, 05:18 PM   #7
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scottm1978~ I don't want to start saying hp numbers but my "butt dyno" says around 10. Lots of torque too. The best is the driveability; there is no lag, the car no longer stutters at low rpms. I would say this piece could flow 300 whp.

dayf~ It would be very unlikely to pass with just the 3rd cat. You would probably be throwing a cel (unless you have an mil eliminator - I'm running the pony express performance one) and the visual would definitely fail. When inspection time comes I will just unbolt the exhaust and put back on the stock downpipe and 3rd cat section.

~Evan
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Old 09-13-2002, 06:25 PM   #8
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Quote:
Originally posted by Dayf
Any chance of passing the sniffer test with only the 3rd cat left over?
do you have a smog guy who will pass you on only the sniffer test? if not, then dont worry about passing smog... the only way to pass in cali LEGALLY is if you have all 3 cats on OR at least have it look like all 3 cats are on. 1 cat may be enough to pass emissions, but we dont know for sure... many turbocharged cars have been able to pass with no cats even...
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Old 09-16-2002, 08:52 AM   #9
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Subarud -

I take it you didn't have an aftermarket DP before installing the Bosal?

I've got a Stromung catless DP now (amongst other goodies,) and am wondering if this is worth the time to swap, or not. It does look fantastic IMHO.

Also, where was the weld too big for fitment of one of the nuts? I'd assume at the turbo flange. How did you rectify this?

Someone just posted a 90 hp gain at the wheels with this DP, an uppipe, and some Yoshio ECU tuning in the FFI forum. Just incase anyone missed it.

Thanks,
Jim
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Old 09-20-2002, 06:54 PM   #10
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Mack~

Yes, that is correct. I was running a vishnu up and stromung 3rd cat eliminator section. The downpipe is an easy bolt on affair. I would say if you were planning to swap out the turbo or go for more performance in the future that it would nice to get this piece. The stromung flat flange design is decent but not the best for power gains. Plus the sounds the eminate from the turbo region are unbelievable with this twin dump design. And it looks pretty sweet in the engine bay. Soon, I will be bolting on a vf series turbo 23/24/29? and I know this piece will be capable of flowing that much exhaust.

Yes, the the extra weld was around the turbo bolt flange on the left side. I solved this dilemma by filing off the extra metal and then it attached well. I had to make a custom heat shield because the stock one didn't fit. All I used was a big flat piece of aluminum bent and cut to shape.

Hope that helps
~Evan

PS. Yeah, I heard about that "90 hp gain" but I'm not convinced...
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Old 09-26-2002, 06:00 PM   #11
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on rallispec's webpage they says that it will throw a CEL. "Due to the elimination of the downpipe catalyst, this part will cause a "catalyst efficiency" code to set." Did this happen to you?

Last edited by austenf740; 09-26-2002 at 06:10 PM.
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Old 09-26-2002, 07:45 PM   #12
subarud
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Default catalyst inefficiency

austenf740~

If you read through my posts it says that I installed a Pony Express Performance MIL (CEL) eliminator. All this electronic fix does is it tells the ECU no matter what your cats are doing (above or below efficiency threshold) that they are running optimally though a resistor fix. This thing costs 20 bucks. I think you can order one from them or from ILP peformance (?). I'm sure that I am throwing a CEL because I'm running catless. However, I will never a get a CEL from exhaust (O2 sensor) because I have it electronically defeated. However, I will still be able to get a CEL from other places throughout the car.

FYI I installed the MIL eliminator while I was installing the bosal downpipe. Before I was NOT getting a CEL while running a vishnu uppipe and stromung 3rd cat eliminator with stock downpipe. I was sure that I would get a CEL with all cats eliminated so I installed the eliminator at the same time as the dp.

Hope that helps,
Evan

PS-Check out their new catback 3"!
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Old 10-02-2002, 01:14 AM   #13
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I've had this downpipe in my car for 3 weeks now. The car is so much more responsive. Drove the car for about 550 miles with the DP so far and no CEL. I also have a catless uppipe. Maintained the third cat.

Very happy with the finish. The welds are ok but overall the quality of the DP is a 9/10 in my book.
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Old 10-11-2002, 11:59 PM   #14
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Just put this downpipe on...got a CEL light about 20 miles after putting it on...It doesnt bother me at all...the car feels so much more responsive with it. One question...what did you guys do with the AC drainage hose...my downpipe sat right on it. Send me a PM and let me know what you guys did.

-Ricky
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Old 10-24-2002, 11:20 PM   #15
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Quote:
Originally posted by Reservoirdog
Just put this downpipe on...got a CEL light about 20 miles after putting it on...It doesnt bother me at all...the car feels so much more responsive with it. One question...what did you guys do with the AC drainage hose...my downpipe sat right on it. Send me a PM and let me know what you guys did.

-Ricky
that pipe gets very hot and might cause damage to that drainage hose.. you really ought to think about preventing them from touching if you can
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Old 01-03-2003, 11:59 AM   #16
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I just had this downpipe installed with an STI uppipe and it is exactly as described. Rallispec was great to deal with..
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Old 01-12-2003, 04:02 AM   #17
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I just installed the Bosal DP, and have a couple questions.

1) Did anyone get the DP heatshields re-installed with this downpipe? There were 2 heatsheilds that pretty much wrap around the top of the stock DP, but they didn't seem to fit around the wastegate pipe so I just left them off for now until I figure out whether that's a bad idea or not. What did you guys do? Did you get them to fit? Are they supposed to fit? Do i really need to put them on or create my own somehow? Rallispec, any input?

2) What's that hose coming out of the firewall for? It looks like some type of drainage hose maybe from the bottom of the windshield??? After installing the DP this hose was resting against the wastegate pipe, so I removed the clip and just sort of set that hose up on the little ledge so it wouldn't get melted by the downpipe. What is this hose for? What did you guys do with this hose?

Thanks for any input. Rallispec, your input would also be appreciated. Thanks.
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Old 01-13-2003, 11:26 PM   #18
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Figured I'd post what i've done to resolve my questions above. I used some snips to cut off the side of the two heatshields so that they would fit around the wastegate pipe. Seems to be fine now.

As far as the A/C drainage hose, i pulled the clip out and inserted it into a similar hole sitting a couple inches to the rear and clipped the hose in there.

Also, FYI, I lasted only 100 miles before CEL, after installing my PDE uppipe and this bosal pipe.
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Old 02-04-2003, 11:25 PM   #19
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FYI,,the Bosal downpipe WILL fit with Cusco lower arm bar version 2.
Like the others said,,my butt dyno gives it faster spool, and retains boost better.
Im happy with mine
Rudy

ps and it does sound good!
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Old 03-05-2003, 05:03 PM   #20
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Just wanted to let anyone know thats reading this....I just picked up this down pipe from http://www.stranoparts.com/

it was $50.00 less than Rallispec!!!!

this pipe is truely badass, AFAIK only the vishnu has divorced wastegate tube as long as this one.
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Old 03-30-2003, 03:52 PM   #21
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Emailed Rallispec..........
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Old 03-31-2003, 05:50 PM   #22
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Just had the sti upipe and bosal downpipe installed.. both purchased from rallispec. the downpipe came with the gaskets, bought gaskets for the upipe for 10 bucks a piece from the dealer. the upipe was supposed to come with a resistor to cancel out the cel, but eastcoastsuby had some extras for me... can be purchased at radio shack for minimal cost. Cut the heatshield and then sanded them down on the cut edge to finish off the job... I should say eastcoastsuby did this for me... he is highly recommended and he knows his stuff... did stuff for vivid etc... if you live in MD that is.

the AC drainage hose was a problem, had to bend it a little bit in the opposite direction and used some tie clips screwed into the body to hold it back, slight bend in the hose but not bad at all. talked to rallispec and they said the hose should not melt as long as you are not on full boost the whole time... remember it lies up against the divorced waste gate and not the main pipe.

The combo resulted in quicker spool up and boost is maxed out a 1.1 bars by 3000 rpms. not the huge kick in the butt I was expecting but I am getting reflashed with dual maps on friday so I will let you know how it goes.

there is a nice little whistle as the gases go through the divorced waste gate when you lay on the throttle.
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Old 03-31-2003, 06:23 PM   #23
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Quote:
Originally posted by Varanont
the AC drainage hose was a problem, had to bend it a little bit in the opposite direction and used some tie clips screwed into the body to hold it back, slight bend in the hose but not bad at all. talked to rallispec and they said the hose should not melt as long as you are not on full boost the whole time... remember it lies up against the divorced waste gate and not the main pipe.
For this I just pulled the existing clip out and moved it towar the rear of the car a couple of inches, there's another hole there that the clip fits right into. The hose bends a little funny, but i think it resolves any potential melting issues as the hose no longer sits against the pipe.
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Old 03-31-2003, 11:45 PM   #24
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Would this be a good first mod ?????? Right now I have a scorpion muffler, and bov
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Old 04-01-2003, 11:58 AM   #25
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The car seems to be getting quicker each day as the ecu learns to adapt to the new parts. Great first mod. Mate it up the sti upipe for a good first mod(s). getting reflashed in a few days with dual maps, will keep all informed.
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