Grass Roots test on Cooper exhaust
i'm not sure where it is, but i know that the helix exhaust got the best numbers!
http://www.helix13.com
i think i'm gonna get it soon.
do a search, some people on the board have their exhaust!
http://www.helix13.com
i think i'm gonna get it soon.
do a search, some people on the board have their exhaust!
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1st Gear
Joined: Apr 2003
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Yes I have read that but where is this test that it won? What was the hp gain? On the helix site it says 8hp with the intake. How about without? It would be interesting to see the difference with all that were tested.
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