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Old 12-15-2005, 03:55 PM   #1
Scooby Newbie
Member#: 77879
Join Date: Dec 2004
Chapter/Region: BAIC
Location: Chico, Ca
2005 Saab 9-2x
Artic Silver

Default 05 Sti Custom tuned- Help with header tuning

I have an 05 Sti with a Turbo back exhaust, injen intake and recently got it dyno tuned by a local shop with cobb protuner. After the tune, I got borla headers. The car seems to have a little more top end, but low and mid range seem to be more than a little sluggish. My question is: Is it possible that my car has lees hp with the headers on there, since it isn't tuned for headers? Will getting it tuned with the headers make a "very noticable difference?"

Please help.
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Old 12-15-2005, 04:35 PM   #2
Scooby Guru
Member#: 60324
Join Date: Apr 2004
Location: a pillow.

yes it's possible you are making less overall power with headers 'untuned'. THis is a mod that is not within the learning specs of the ECU and should be retuned for.
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Old 12-15-2005, 08:34 PM   #3
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Member#: 15350
Join Date: Feb 2002
Location: Bay Area, CA
2002 WRX Sedan
Midnight Black


Keep in mind however, that Even with different tuning, MOST(maybe ALL) aftermarket headers will be more laggy in the low and mid-range.

I have Megan Racing headers now and they cracked, so I just finished the Port 'n' Polish on stock manifolds earlier this week. I almost looking forward to seeing the better low end again...

My .02

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Old 12-15-2005, 09:19 PM   #4
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Member#: 90691
Join Date: Jul 2005
Chapter/Region: MAIC
Location: Manchester, Maryland
2005 STI / 2009 STI


With headers and not being tuned you will give up low end tourqe. It can be tuned though. On my stock turbo setup I had about 269 Ft lbs of torque at 2600 rpm, that was monsterous!
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Old 12-15-2005, 09:56 PM   #5
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Join Date: Aug 2004
Chapter/Region: South East
Location: 'tween Lewisville&Clemmons NC
1998 TransAm cnvrtbl


Potential for more taper at the top end too. I had to add to the boost map up high. But that'll depend a lot on the turbo as well. Mine's a little Kong II, which is about like stock.
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