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Old 07-03-2008, 11:28 AM   #1 (permalink)
 
Join Date: Jul 2008
Posts: 9
Cool Header+DP

I have an 05' SS stage 2. I got the Magnaflow 2.5 cat back, and a drop in K&N. Looking for a good header and downpipe. Vibrant ? CTI ? Also how bout pulley size from GM, can I go smaller with the Stage 2 program?
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Old 07-03-2008, 04:43 PM   #2 (permalink)
 
Join Date: Jun 2008
Posts: 12
I wouldnt go any lower than a 2.9 pulley, you need larger injectors for anything below a 2.85 and a different tune for the injectors, also you need some cooling mods, because your just hurting yourself if you go with a smaller pulley, blowing in too much heat, youll lose HP. Also definately do not go with the 2.7, you looking for problems and too much boost for A/F ratio, thinking maybe a blown motor and a voided warranty. Also if you still have warranty I would stick with all GM parts, they know best, they have a 2.9 pulley that goes with their stage 3, but you can just run the pulley, the PCM is usless unless you plan on running NOS.

Last edited by Jbones2285; 07-03-2008 at 04:46 PM.
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Old 07-04-2008, 10:41 AM   #3 (permalink)
 
Join Date: Jul 2008
Posts: 9
Thanks Jbones, good info to know. I may try the stage 3 pulley then and decide on a header and dp. Maybe NOS next year. I wanna change my blade on the wing to carbon fiber yet. I put on some Konig wheels and Nitto Invos this spring. I get very little slip from those tires! They are quiet on the highway too.
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Old 07-04-2008, 09:22 PM   #4 (permalink)
 
Join Date: Feb 2008
Posts: 32
a buddy of mine got the vibrant header/dp combo and the gmpp exhaust..its not that loud until he gets on it on ....so vibrant is ok, so is the zzp combo....either one is a good choice...
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