Changing set up.
Thread Starter
Team Owner
Joined: Mar 2005
Posts: 20,933
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From: salem OR
Changing set up.
I want to sell my Kook's 1 3/4.2 1/2 out. Then go with AR 1 7/8's. 3 inch out. 2 reasons the Ar"s move the cats downstream plus I think I need 1 7/8's with the blower! Thought's 
Safety Car
Joined: Oct 2001
Posts: 4,945
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From: Dallas/Valley Ranch TEXAS!!!
Truth be told I still have my Dynatech 1 3/4's on my set up, even had them repaired not too long ago... lots of BIG speed bumps here in Texas...
So it depends on what your looking for... do you have a methanol kit on the car? or a good F.I cam?
So it depends on what your looking for... do you have a methanol kit on the car? or a good F.I cam?
Safety Car
Joined: Aug 2004
Posts: 4,067
Likes: 62
From: Houston Texas
Honestly this has been debated for years on the forum and tests have shown over and over that gains are minimal with 1 7/8 in some cases you can lose some bottom end. I am all about going 3" all the way out the back, you get a better flow and it sounds deeper like a 427. My buddy put on 3" with Z mufflers and you would have thought it was an LS7.
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I have the same set up - it does sound great. Blowers typically like more exhaust flow. Call Kooks, they will know for sure. I was asking about the stepped headers when I built my engine, but Both Kooks and AR recommended straight 1-7/8 for me on my 427ci up to 1,000whp. The Kooks were $400 less expensive when I was in the market.
