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Old 08-20-2004, 03:37 PM   #1
Pete Holt
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Default GP Moto equal length header

I saw this header on Teague's site with some crazy power gains listed near 40ft/lbs. and 40hp. Has anyone tried one of these out or think they are actually worth the money? They used to be around $1,000 and now they have dropped closer to $600. I have an '02 WRX with the Cobb stage 2 kit on it right now and I would think this equal length header with the integrated up-pipe would definitely help my turbo spool up a little quicker. I would probably sacrifice some low-end in the process. Any thoughts or reviews?

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Old 08-20-2004, 04:21 PM   #2
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Definently a good product i have seen one installed, i can't attest to the power gains on a dyno but my butt dyno tells me there was a definitive difference. The car is running an ecutek and last time i checked he had not been reflashed for optimal performance. One thing to remember this totally will change the sound of the motor the lumpy idle of the wrx disappears sounds more like a gp bike at full song than a car and it is definently not fart can honda sounding one of these just sold on ebay for $725 so $600 is a good price and that was used.
i don't really think spool was affected that much by this upgrade if at all and low end is a not a nice termto speak of when you are talking about the EJ20 if you want low end you need an overbore or stroker kit it basically comes down to you need more displacement to make real good low end. I will contact my buddy and see if i can get him to espond to the thread
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Old 08-20-2004, 04:27 PM   #3
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You will gain power, but the car will *not* spool up quicker. It'll also sound like ****... more like a raspy honda than a boxer.
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Old 08-20-2004, 05:14 PM   #4
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Interesting. I know what you mean about the lack of any low end to begin with on the EJ20. I guess it is all relative. I didn't realize that the sound would change that much as I had a borla header on my old 2.5RS and it sounded awesome. So WRXCHAD, you think it sounds good and not like a Honda and MB38, you think it sounds like a raspy Honda. Anybody else?
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Old 08-20-2004, 05:57 PM   #5
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Quote:
Originally Posted by MB38
You will gain power, but the car will *not* spool up quicker. It'll also sound like ****... more like a raspy honda than a boxer.
All things being equal, it should spool the turbo faster. There may be something else holding it back, but getting equally spaced exhaust pulses does help fight reversion. It may just not be very obvious on the stock turbo, which is fairly small. On a larger turbo the difference in spoolup will be more noticable.

Whether it sounds like a raspy Honda will probably depend a lot on the muffler used. It'd probably sound very nice with a deeper toned and slightly quieter muffler.

Adrian~
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Old 08-20-2004, 06:23 PM   #6
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I have one on my personal car, and have sold and installed many GP moto headers. There is no real loss in spool, most cars seem to spool about the same. It changes the cars powerband dramatically, especially after tuning. my car (03 WRX) w\ the stock turbo put down 260 ft lbs of torque on the dyno, and is as fast (faster in some cases) as a stage 4 car. The car can sound a bit odd w\ a chambered or stock muffler. If you use a straight flow exhaust and muffler the car will sound great.

Regards,
Ashley

By the way we sell these mufflers thermal coated and non coated. PM me for pricing.
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Old 08-20-2004, 06:55 PM   #7
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Quote:
Originally Posted by Dynamispeed
my car (03 WRX) w\ the stock turbo put down 260 ft lbs of torque on the dyno, and is as fast (faster in some cases) as a stage 4 car.
You owe me a rematch... the silencer is now out.
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Old 08-20-2004, 06:55 PM   #8
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You should check out QTPs equal lenght header. It comes Jet Hot 2000 coated. Its a real nice piece. Saving up for it myself. Seen it on the QTP car. They gained like 40hp and gave them some crazy torque too. I guess thats why they are the fastest stock turbo wrx right now. Check it out. www.quicktimeperformance.com
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Old 08-20-2004, 07:12 PM   #9
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My '02 WRX has the Cobb 3" downpipe with high flow cat, and 3" midpipe with high flow muffler so it should sound pretty decent. I also have the accessport so it is set up for the stage 2 fuel map right now. I just hope that header will not throw check engine lights or throw it out of tune.
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Old 08-20-2004, 07:29 PM   #10
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It should be fine and sound great. I've installed the header on a similar modded car. (stage2 w\ acessport stage 2) we ran the car w\ the stock manifold, then ran a cusco header, which was a slight improvement. Then a couple months later he switched to the GP MOTO header and the car was MUCH better than the cusco and the stock manifold. The car had a much wider torque band and pulled a little harder up top. I also checked a\f ratio and it was still fine w\ the acessport installed.

Regards,
Ashley
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Old 08-20-2004, 07:30 PM   #11
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Quote:
Originally Posted by MINO
You owe me a rematch... the silencer is now out.
Yes I do
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Old 08-20-2004, 10:30 PM   #12
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i cant personally speak of the gp moto header, but i can attest the difference in sound that accompanies headers. I helped my friend install a gtspec header and the thing sounds alot different. It's alot louder, engine is much more audible up front. Personally, i dont like the sound and am in love with the boxer sound. I cant put a finger on the sound difference.. only that i didnt really like it.. Maybe u could consider it hondaish.
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Old 08-20-2004, 10:50 PM   #13
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Quote:
Originally Posted by Pete Holt
My '02 WRX has the Cobb 3" downpipe with high flow cat, and 3" midpipe with high flow muffler so it should sound pretty decent. I also have the accessport so it is set up for the stage 2 fuel map right now. I just hope that header will not throw check engine lights or throw it out of tune.
Talk to cobb before. Thier maps are not made for headers... he has talked headers on the cobb forums. I realy dont remember if he said the stage 2 with headers was good or pushing it. I belive its ok tho...
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Old 08-21-2004, 12:07 AM   #14
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Quote:
Originally Posted by Dynamispeed
Regards,
Ashley

By the way we sell these mufflers thermal coated and non coated. PM me for pricing.

Where you been? Would you care to comment on this:
http://forums.nasioc.com/forums/show...4&page=3&pp=25
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Old 08-21-2004, 12:08 AM   #15
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Quote:
Originally Posted by Dynamispeed
I have one on my personal car, and have sold and installed many GP moto headers. There is no real loss in spool, most cars seem to spool about the same. It changes the cars powerband dramatically, especially after tuning. my car (03 WRX) w\ the stock turbo put down 260 ft lbs of torque on the dyno, and is as fast (faster in some cases) as a stage 4 car. The car can sound a bit odd w\ a chambered or stock muffler. If you use a straight flow exhaust and muffler the car will sound great.

Regards,
Ashley

By the way we sell these mufflers thermal coated and non coated. PM me for pricing.
Any sound clips? I'd do it for hte power gains but I'm not going back to sounding like a Honda again... I love the boxer sound too much. I have a txs rfl-ti tbe.
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Old 08-21-2004, 03:03 AM   #16
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Whats better performance wise? equal length or unequal length?
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Old 08-21-2004, 09:57 AM   #17
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The equal length should give much better performance than an unequal length header, I am just unsure about the sound performance. I think I will like the GP Moto if it is louder as I think my WRX is still too quiet and my RS sounded awesome with the Borla header and Stromung header back free flow exhaust. I am worried about it sounding like a Honduh though because that is definitely something I do not want. My old Borla made the 2.5 sound pissed off and everyone thought it was misfiring, but that was just the nice boxer rumble that made my 4cyl. sound like a V8. Does anyone have a sound clip of the GP Moto on the EJ20?

Thanks,
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Old 08-21-2004, 10:43 AM   #18
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Quote:
Originally Posted by LeadPipe
Whats better performance wise? equal length or unequal length?
Its not that easy. There is a lot more theat goes into header design. Should an equal length flow better then an unequal? Yes, but look at everything else too. Size of the runners, welds( number of them and quality), bends, lenth...
Some info.

http://www.vishnutuning.com/exhaust101.htm
http://www.cobbtuning.com/tech/exhaustdesign/index.html
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Old 08-21-2004, 11:39 AM   #19
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Here is a video of the qtp car launching. It will give you an idea on how there Tri Y header sounds.
http://www.quicktimeperformance.com/Media/WRXSSSIII.wmv
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Old 08-21-2004, 10:37 PM   #20
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Quote:
Originally Posted by SINthetic
Here is a video of the qtp car launching. It will give you an idea on how there Tri Y header sounds.
http://www.quicktimeperformance.com/Media/WRXSSSIII.wmv
Is that with their cutout or a muffler?
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Old 08-22-2004, 11:23 AM   #21
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I will be running an equal length Exhaust Manifold on my GC8. Currently I am still in the process of completing swapping out the EJ20G to an EJ207. From information I am getting from hyper rev and a few other suby specific mags equal length gives a little more in the TQ department!!!

This is magazines saying this not me so do not get in an uproar. Also I know many people on here have been tuning the EJ20 for some time but I do have to go with people that have been tuning subys for 10+ years.
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Old 08-22-2004, 12:09 PM   #22
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Quote:
Originally Posted by Silver '02 REX
Is that with their cutout or a muffler?
I believe it is with there cutout.
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Old 08-22-2004, 12:11 PM   #23
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Hey Pete, I have the Fujitsubo style GP Moto equal length header on my car. If you ever come down to a MWIC meet, let me know and I'll try to catch up with you so you can hear it. It does loose the "boxer" (ie unequal length header) rumble, but it sure doesn't sound like your standard honda either.

Larry
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Old 08-22-2004, 12:40 PM   #24
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I lost power. This is in a 04 STI.
Use to have a 4-1 TopSpeed header and it pulled all the way to redline. Now with the Gp-Moto I loose power after 5krpm. And the EGT is wiked hot. With the TopSpeed that car never went higher than 8.1 EGT(Defi guages) with the GP-Moto its on 9.2(Defi gauges)..and I lost all the boxer rumble wich I LOVED. Now my car sounds like a Honda Civic...
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Old 08-22-2004, 12:57 PM   #25
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Quote:
Originally Posted by DuoMaxwell
I will be running an equal length Exhaust Manifold on my GC8. Currently I am still in the process of completing swapping out the EJ20G to an EJ207. From information I am getting from hyper rev and a few other suby specific mags equal length gives a little more in the TQ department!!!

This is magazines saying this not me so do not get in an uproar. Also I know many people on here have been tuning the EJ20 for some time but I do have to go with people that have been tuning subys for 10+ years.
Dude I say just run 207 heads on your block... thats where you going to pick up all your power.
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