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Discussion Starter #1 (Edited)
My goal is 400-425 rwhp. I currently have the 2.5" ART exhaust system. Im adding ported and polished NPI's this winter.

Will I be better off with the 1 5/8" to 2.5" collector or the 1 3/4" to 3" collector.

Thanks.

Check out the Kooks Group Purchase thread too....GP thread
 

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if your going to have 425 at the wheels then you will have 5 something at the crank.
so i would go with the 3"
 

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I'm running N/A with Jim's NPI heads and I put the bigger Kooks on. My best 60's are high 1.8's - low 1.9's so I don't think I'm giving up any low end.
I originally ordered the small ones and when I told JL and some others that I was adding the Renegade heads and intending to SC down the road, it was suggested that I upgrade to the bigger ones and they seem to be working for me...

That's my experience


You're doing everything you can to get air in, you might as well do everything you can to let it exhale...

But that's just my opinion.



I'm pretty sure JL has the bigger Kooks, too, and his 60's are quicker than mine....

You know what MajerThom says, "Let it breathe."
 
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