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Old 11-14-2003, 04:37 PM   #1
TrizzyDizzy
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Default Too many downpipes!

Ok im aiming for around 400hp, thas it. Which one should i get? Invidia, TurboXS, HKS, etc. Ive heard alot of stuff such as the benefits of bellmouth and whatever, but what is the best. Also i dont want a CEL. Do all of the downpipes bolt to stock exhaust? Thanks
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Old 11-14-2003, 05:10 PM   #2
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if your aiming for 400+hp i would get a bell mounth design, such as perins or cusco, also do you want to go cat-less. if your want the best and are not worried about money, id go with perin or cusco
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Old 11-14-2003, 05:11 PM   #3
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Well i am worrying about cost. I dont want to spend more than 150-200 used for a good down pipe. Also i dont care about cats, because Montgomery doesnt haha.
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Old 11-14-2003, 10:42 PM   #4
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Old 11-16-2003, 05:17 PM   #5
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Quote:
Originally posted by Unabomber
Downpipe FAQ
Very helpful thanks

Slight subject change but I've seen a diagram of the WRX exhaust laid out (like cad or good drawing) somewhere on the forum but I'm unable to find it. If anyone knows where or can link me I'd appreciate it. Thanks
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Old 11-17-2003, 02:10 PM   #6
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I have the invidia 3 inch bellmouth dp. Its awesome! I love it! Way quick spool up!

-Chris
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Old 11-20-2003, 03:14 PM   #7
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Quote:
Originally posted by CynicX
Very helpful thanks

Slight subject change but I've seen a diagram of the WRX exhaust laid out (like cad or good drawing) somewhere on the forum but I'm unable to find it. If anyone knows where or can link me I'd appreciate it. Thanks
Perhaps one of these.

http://www.mattrandolph.com/wrx/wrx-exhaust.gif

http://www.mattrandolph.com/wrx/wrx-...st-diagram.gif

edit: here's another
http://www.mattrandolph.com/wrx/turbo-piping.gif

Last edited by plunk10; 11-20-2003 at 03:40 PM.
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Old 11-21-2003, 03:40 PM   #8
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Quote:
Originally posted by wrxruIes
if your aiming for 400+hp i would get a bell mounth design, such as perins or cusco, also do you want to go cat-less. if your want the best and are not worried about money, id go with perin or cusco


ummm.. perrin and cusco are not bellmouths..

the perrin is divorced.. and the cusco is just sort of welded and blocked off..

bellmouths would be: txs, helix, invidia.. anything that has 1 large open pipe.

divorced is where the wastegate stream is "divorced" from the normal exhaust and they mate together further down the stream

also.. be aware that JDM spec and USDM spec downpipes fit different with catbacks..
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Old 11-23-2003, 01:21 AM   #9
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Go with a wastegate dump side. It allows free flow and helps turbulence when turbo spools up, thus allowing a better spool and better flow of air.
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Old 11-25-2003, 11:00 PM   #10
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I"m looking for a similar pipe, I've read all kinds of good things about bell mouths,

WRX-mike are you saying to go with the divorced?
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Old 11-28-2003, 10:35 PM   #11
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TXS is a bellmount (so is ScoobySport), but you have to chose the size. 3" or 2.5"... after riding in 2 completely different cars (one w/ 3.0" and the other with 2.5") I found I liked the 2.5" myself. They were totally different, they were not close to 400HP, but the low end torque of the 2.5" sold me.

Rich
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Old 12-02-2003, 01:53 PM   #12
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You should get the bellmouth or divorced dp. They all should bolt up to the stock exhaust. You might want to consider getting a dp that will replace your mid pipe also. So you can get rid of both cats at the same time, better bang for your buck.
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Old 12-02-2003, 01:56 PM   #13
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Quote:
Originally posted by SJwrx
TXS is a bellmount (so is ScoobySport), but you have to chose the size. 3" or 2.5"... after riding in 2 completely different cars (one w/ 3.0" and the other with 2.5") I found I liked the 2.5" myself. They were totally different, they were not close to 400HP, but the low end torque of the 2.5" sold me.

Rich
you should go with the larger 3" pipe. Turbos do not like back pressure. The more free flow, the better. For TBE, bigger is always better.
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Old 12-02-2003, 03:01 PM   #14
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Quote:
Originally posted by STi City
you should go with the larger 3" pipe. Turbos do not like back pressure. The more free flow, the better. For TBE, bigger is always better.
I have to disagree with you... to prove my point go run straight downpipe and see if the power is there...

Yes you get good HP readings, but they are FAR up the RPM ladder and don't offer the toque that a smaller tubing will provide. Turbo's need backpressure too.

Rich
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Old 05-24-2004, 06:40 AM   #15
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Quote:
Originally posted by STi City
You should get the bellmouth or divorced dp. They all should bolt up to the stock exhaust. You might want to consider getting a dp that will replace your mid pipe also. So you can get rid of both cats at the same time, better bang for your buck.
If you go with a bellmouth, you have to make sure it will fit a USDM catback. For example, Invidia's downpipe is JDM and will only fit JDM catbacks(USDM catbacks will have to be shortened).
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Old 08-11-2004, 10:26 PM   #16
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I got the Perrin down pipe backed by a 3" Espilir cat backand and the dp has a seperated part for wastegate. very high quality. You will get a cel. Simple fix is splice in a cel fix diode between the sensor and plug. Thats what I did. No more cell.
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Old 08-11-2004, 10:29 PM   #17
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Quote:
Originally Posted by SJwrx
I have to disagree with you... to prove my point go run straight downpipe and see if the power is there...

Yes you get good HP readings, but they are FAR up the RPM ladder and don't offer the toque that a smaller tubing will provide. Turbo's need backpressure too.

Rich
You should let the guys as Cobb know this.

http://www.cobbtuning.com/tech/exhaustdesign/index.html
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Old 08-16-2004, 05:25 PM   #18
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No cats, no CEL and a bellmouth...

I'm going to go with the Godspeed

-J
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Old 08-17-2004, 10:25 PM   #19
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If yo want the most horsepower out of a down pipe look at the QTP Cutout Downpipe. Up up the exhaust with the flip of a switch. I have one and its awesome.
www.quicktimeperformance.com
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Old 09-25-2004, 11:27 PM   #20
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wouldn't all aftermarket dp cause boost creep?
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Old 09-26-2004, 09:33 AM   #21
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If your worried about cost, go with the Helix DP.


-Mark
www.MAPmotors.com
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Old 09-26-2004, 05:31 PM   #22
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Quote:
Originally Posted by mrbigisbudgood
You should let the guys as Cobb know this.

http://www.cobbtuning.com/tech/exhaustdesign/index.html
For a company that JUST started to make anything more than a cat-back for the WRX's., Ill stay with my flow benched ScoobySport.

Rich
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Old 09-29-2004, 10:04 PM   #23
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i have the heilx down pipe and i love it
i got the whole 3" helix cat-less system
www.subydude.com for 850$ shipped
with that alone i got 25hp gain dyno proven

steve
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Old 11-09-2004, 07:24 AM   #24
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if you got the money id say go with perrin. i got their's and i love it.
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Old 11-17-2004, 09:21 PM   #25
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I also have the Helix DP. It's identical to the Invidia. The spool up is much better, and I'm definitely not disappointed. I have it mated up to a catless Invidia Ti-Tip 3" catback. Absolutely awesome.
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