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Old 05-18-2009, 03:05 PM   #11
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ok so high flow cat is ok. now I'm thinking of running a 2.5" system could I get a 3" cat or would that cause a crazy turbulence in the system and stay with the 2.5" set up. Also with me changing my front header and cross over will the bolt into the stock rear header?
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Old 05-18-2009, 03:30 PM   #12
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At your mod level, it won't necessarily hurt, only position you for future mods.

Plog and cross over should boltup if you stick with a stocker and coat it. shouldn't hurt anything. Although you should skew your front injectors by 2% IIRC.
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Old 05-18-2009, 10:10 PM   #13
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Quote:
Originally Posted by BillBoost37 View Post
At your mod level, it won't necessarily hurt, only position you for future mods.

Plog and cross over should boltup if you stick with a stocker and coat it. shouldn't hurt anything. Although you should skew your front injectors by 2% IIRC.
that where you can come in my friend can you help my tune my car once this all gets done
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Old 05-18-2009, 10:32 PM   #14
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Another thing now. ( I should write all my ideas down) I see the down pipe for the bonneville is either off road or they weld on the cat. Will a 3" down pipe hook up to my stock rear header? or will I have to get the 2.5" off road and cut out where the cat goes, OR, will ZZP make a 2.5 down pipe with a 3" cat for me you think? I dont want to loose too much back pressure and torque I really want to use a 2.5 downpipe or will a 3" be the best. I am N/A btw
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