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Old 12-21-2002, 10:31 PM   #1
Scott F. Williams
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Default Borla Gen 4 header results

Hey, guys. I just installed my Borlas yesterday evening. The installation was very easy, everything lined right up, and rust didn't fall in my eyes. Once I got everything bolted together I fired her up and listened to the music. It sounds kind like a really deep and growly "badadarroOOM-zingg-badadada. LOL. -a badass growl which takes on a slight metallic sizzle at high rpms but never loses its bark, either. Basically, it sounds like a really quiet rallycar. -that or a four-pack of KTM 1-cyl dirtbikes with synchonized throttles.

The header feeds a Stromung catback exhaust that was installed previously. From a seat of the pants perspective, the gains are not huge, but they are definitely decent. Whereas before, the car accelerated steadily through the revs, the car now surges in the midrange. The bottom end was left pretty much the same as it was before, but the top end is helped out just a teeny bit. The responsiveness between 3k and 4.5k is really nice.

What's not so much fun, I think, is that the cylinder heads/cams aren't up to the task. I'm sure that there really is much power to be gained by porting the heads and going with some bigger cams. The way this engine sprints to 5k rpms and then goes limp like a washed up pornstar really pisses me off. Bah...

Anyway, the Borlas are lots of fun.
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Old 12-22-2002, 01:28 AM   #2
cvalle-sd
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hmmm...I gotta get one of those.
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Old 12-22-2002, 03:09 AM   #3
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Question Input

If anybody else has these, please post any info relative to the Gen 4 headers. I am interested in purchasing these but need to hear more feedback. Any check engine light issues/solutions? Dyno figures? Possible hazards and or cylinder/cams damage? Any input is appreciated.
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Old 12-22-2002, 10:53 AM   #4
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i just got them as well. i got a cel, but it's a resulot of the high-flow cat, noty the headers. As far as damaging the cylinders an cams, i don't know for sure, but it seems very improbable to me. And dyno results, I seem to remember seeing numbers on the Ralli Tek site.

hope this helps. And btw, I'm really pleased with them.

--eric
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Old 12-22-2002, 11:59 AM   #5
Scott F. Williams
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Default what effect is hiflo cat?

QAboy, did you install your cat after the header/exhaust or at the same time? How much of a gain did you realize? Where does the power come on and drop off? Is the bottom end sacraficed at all? I've already got the header/exhaust installed, but it is with my stock cat. I'd like to know what I'm getting into before I do the swap. Oh, how much did you pay for the cat, btw?
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Old 12-22-2002, 05:40 PM   #6
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Just installed the Gen 4 Borla headers. I have a 2.2L, so it was a single port header. So far I havent put on my brullen cat-back system yet. But my first impression was that it was quiet when I turned the ignition switch, maybe even quieter than stock, but when I drove off, I started to hear the headers raspy sound. It surprised me when I started to hear it. Its not as loud or as I expected them to be, but with the cat-back installed they should sound at least deeper. When in the car, it doesnt sound as mean, I had a friend drive it around the block so I can hear it come and go from the outside. It has more bass and definitely sounds meaner from the outside. As for power, it seems like its slower and weaker on the lower end, and stronger above 2500 rpm, my car likes to try to idle lower now. Its a 4eat, used to idle at about 1500, now it idles about 500, no BS. Its definitely even smoother during shifts now. Im doing a 5MT swap late January, so I might wait til after that to slap on the "quiet" version brullen catback. Hope what I said can help someone else.
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Old 12-22-2002, 05:49 PM   #7
obyone
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Congrads on the upgrades bro.

Just to poke a little fun at you, my car still faster.

My MRT header back (with a Stromung can) system will outrun your Borla/Stromy cat back. I was able to whoop my friend, who has the same set up as you, except he also has a clutch and flywheel.

The one thing about your setup, that I am jealous about, is the sound. My friend's exhaust sounds 10X meaner than mine under power, but mine is quieter at idle. My MRT (with a Stromung can) kinda sounds a little ricey under power.

So I'm not talking down to you, just poking a little fun.
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Old 12-22-2002, 08:09 PM   #8
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I have them on my car too almost 2 and a half years now and the sound and performance is great. Its the nicest sounding exhaust I have ever heard. Even the domestic guys I see cruising around like how it sounds.
I have gotten ton of compliments, and Iím flattered every time. Kinda reminds me of a Porsche exhaust, get them since the price has gone down. Its dark hear but I can have some more detailed pics for you tomorrow. Just got my digi cam its great. Here is one just taken a couple days ago.

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Old 12-23-2002, 02:59 AM   #9
ScoobyNRG
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I installed the Borla Gen 4 headers in early October in my '00 RS. I love mine. Performance, fit and sound are really nice. I have the stock cat with the STi/Brospeed cat back exhaust. The engine spools up quicker and it opened up the mid and high range power a bit (no dyno test, but the butt-o-meter showed a difference) and has a nice rumble in sound. I haven't gotten any CELs, I wrapped my Borlas with a quality header wrap so I wouldn't get a CEL. The wrap keeps the exhaust gas nice and hot for the cat. I did the install by myself and it went really well, it would have been a little easier with an extra set of hands but it still wasn't bad at all. The only real pain in the butt was the cat bolts. Just soak the bolts down with WD-40 or something like that and use a 6 point socket, DO NOT USE a 12 point or you will most likely round out the nuts like I almost did.

Tim

Last edited by ScoobyNRG; 12-23-2002 at 03:08 AM.
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Old 12-23-2002, 12:38 PM   #10
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i don't have any dyno numbers either, BUT i have noticed the car does pull better in the midrange (from 2K on up). looking at my apex RSM at WOT acceleration, the car IS pulling harder, since my accelerating G's are reading a bit higher. yes, it's no substitue for a real dyno run, but its more accurate than the butt dyno...it's like a digital readout for the butt dyno.
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Old 12-23-2002, 01:13 PM   #11
cRayZee
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Quote:
Originally posted by obyone
Congrads on the upgrades bro.

Just to poke a little fun at you, my car still faster.

My MRT header back (with a Stromung can) system will outrun your Borla/Stromy cat back. I was able to whoop my friend, who has the same set up as you, except he also has a clutch and flywheel.

The one thing about your setup, that I am jealous about, is the sound. My friend's exhaust sounds 10X meaner than mine under power, but mine is quieter at idle. My MRT (with a Stromung can) kinda sounds a little ricey under power.

So I'm not talking down to you, just poking a little fun.
Just to poke a little more fun
my car is also faster. My friend has the borla headers, stromung catback, udp and ganzflow intake. I have similar mods, except I'm on the stock headers, custom made 2.25" non-mandrel bent exhaust and stock pulley, with a tec 2 Tried running a couple times and my car would slowly walk away from his car.
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Old 12-23-2002, 03:59 PM   #12
Jademonkey
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Default Re: Input

Quote:
Originally posted by Bumsarama
If anybody else has these, please post any info relative to the Gen 4 headers. I am interested in purchasing these but need to hear more feedback. Any check engine light issues/solutions? Dyno figures? Possible hazards and or cylinder/cams damage? Any input is appreciated.
I'd say go for it. I've had the header's on for about...9 months or so with the borla catback. It did have that metallic rumbly rasp to it, but it's quieted down to just a low rumble. I haven't had a CEL yet. I went ahead and wrapped part of the header, closest to the cat (Borla recommends doing this to keep from getting CEL). I only wrapped up maybe 18 inches from the cat. The only hazards are changing your oil... It's more difficult to get your arm around the borla, than the stock config. I have a nice burn mark that's about.... 9 months old from trying to pull the filter off.

edit: if you wrap your header, be sure to spray some high temp coating on it, the wrap will last longer.
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Old 12-23-2002, 05:33 PM   #13
AndyM
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pictures I promised:









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Old 12-23-2002, 11:48 PM   #14
Scott F. Williams
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Default Just got a CEL

Fooooook... I just got a CEL on my second day of driving the car with the Gen 4 headers. Or, at least that's what I was told I bought, anyway. (I picked'm up used here.) Anyway, I noticed that the car was idling really low -at around 500rpms. It was smooth as silk and really quiet. I was very happy about that until the damned light came on a mile down the road. Oh well...

So, will resetting the ECU fix the problem temporarily, at least? Again, my set up is Borla Gen4 headers, stock cat, and Stromung 2.25" exhaust.

Thanks,
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Old 12-24-2002, 03:49 AM   #15
Penphoe
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Default Re: Just got a CEL

Quote:
Originally posted by Scott F. Williams
Fooooook... I just got a CEL on my second day of driving the car with the Gen 4 headers. Or, at least that's what I was told I bought, anyway. (I picked'm up used here.) Anyway, I noticed that the car was idling really low -at around 500rpms. It was smooth as silk and really quiet. I was very happy about that until the damned light came on a mile down the road. Oh well...

So, will resetting the ECU fix the problem temporarily, at least? Again, my set up is Borla Gen4 headers, stock cat, and Stromung 2.25" exhaust.

Thanks,
Are you sure you're idling at 500rpm? If you look closely, the first "line" after the zero mark IS the 500rpm line.

Pull the code to see what kind of error it is. It may have nothing to do with your headers at all!

LaterZ!
Darren!!
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Old 12-24-2002, 11:48 PM   #16
Scott F. Williams
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Default reset ECU/ fixed CEL/

To reset the ECU today, I:

a) disconnected the negative battery terminal
b) stepped on the brakes to discharge the ECU
c) waited 20 minutes
d) reconnected the battery cable
e) started the car and idled (without using the gas pedal) for 10 minutes
f) went for a very fast drive!

This wiped out the CEL that I got a day or two ago. I suppose it also got the ECU to relearn it's mapping and optimized it to the new exhaust flow characteristics. There's now *quite* a bit more midrange and high-end torque. Wow! I'm now very impressed with this header. :thumbs up:
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Old 12-24-2002, 11:49 PM   #17
Scott F. Williams
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Silverthorn Metallic

Default reset ECU/ fixed CEL/

To reset the ECU today, I:

a) disconnected the negative battery terminal
b) stepped on the brakes to discharge the ECU
c) waited 20 minutes
d) reconnected the battery cable
e) started the car and idled (without using the gas pedal) for 10 minutes
f) went for a very fast drive!

This wiped out the CEL that I got a day or two ago. I suppose it also got the ECU to relearn it's mapping and optimized it to the new exhaust flow characteristics. There's now *quite* a bit more midrange and high-end torque. Wow! I'm now very impressed with this header. :thumbs up:
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Old 12-25-2002, 12:54 AM   #18
RSman2.5
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Default

I installed my GEN 4 borla headers a while back... Other than that i have a stromung cat back. The borlas are sweet and definately worth getting. However i did get a CEL. The code is 420 which is cat inneficeincy... It doesn't mean anything, just that the o2 sensor reads more exhuast flowing which is a good thing... resettin ghte ecu will do nothing it will just come back on.. I just ignore the CEL because it doesn't mean anything. Anyway i recommend the borlas
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Old 12-27-2002, 03:34 AM   #19
ScoobyNRG
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Post

RSman2.5 - The cat inefficiency code is due to the exhaust gases cooling down too much for the cat to work within its perameters set by the ecu. The cat works best when the gases are within certain temp range, and when they are not, the ecu wigs and pops out a code. That's why I wrapped my headers with header wrap. Even in the coldest weather so far, my car hasn't popped a code. You are right about wasting time resetting the code, because it will just keep coming back as long as the gases are cooling down too much. Like the condom comercial says, Wrap that rascal, you'll be glad you did.

I'm not trying to insult, just trying to help out and explain.

Tim
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Old 12-27-2002, 10:37 AM   #20
Scott F. Williams
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Default thanks for the info!

This is all great info, guys. I appreciate the help. What's ironic is that I've now been offered a very low price turbo system. These header systems might end up being a moot point. Hee hee...
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Old 12-27-2002, 11:06 PM   #21
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Default Re: thanks for the info!

Quote:
Originally posted by Scott F. Williams
This is all great info, guys. I appreciate the help. What's ironic is that I've now been offered a very low price turbo system. These header systems might end up being a moot point. Hee hee...
I thought these headers work fine with a turbo kit?
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Old 12-28-2002, 12:15 AM   #22
Slack
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Default

From what I've read, most turbo kits for 2.5 and 2.2 cars fit stock or aftermarket headers.


Mick
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