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Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 04-13-2007, 09:02 AM   #11
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IIRC my measurements on the inner pipe after it necks down is around 2"

2.5 would be a difference, the question is.. are you willing to sacrifice the low end for the high end? Being SC'd and running a small pulley, I went to 3" and noticed low end loss. BUT...I had more than enough low end to light them after the fact.

Merely know that there will be a noted difference.
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Old 04-13-2007, 09:09 AM   #12
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These motors are choked at higher RPM'*. They need all the flow they can get. A 2.5 would be a marginal loss in low-end, prolly nothing terribly noticable. Even on GP'* which have an even more restrictive DP, there are more gains than losses when going to a larger DP. A friend of mine switched to a 2.5" on his GP GT and had great results. Addtionally, the gain in flow will help reduce any KR (yea, the N/A motor can still get KR).
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Old 04-13-2007, 05:20 PM   #13
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the biggest thing I am looking for is the midrange. I feel that the low end is good enough for me. If I can get a smooth pull that is Ideally what I would like. It is not super important to smoke the tires to me. If I can get a setup where the mid is better and if the I open it up I should see the better mileage here in the mountains. Better flow better mileage right
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Old 04-13-2007, 08:13 PM   #14
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Yes, you will gain mileage.
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Old 04-13-2007, 09:48 PM   #15
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power and mileage are the goals. Sound is the next thing but that can always be tweaked
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