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Discussion Starter · #1 ·
Iput a cat. back exhaust on about a yr. ago> It worked awesome,but recently put a 3in cat deleting downpipe on and the car slowed around 4 tenths a four mph ! it feels very flat !!! has anybody else heard of this sort of thing because iI sure the hell cant figure it out? thanks for any input !p.s.other mods stage 1 fm accuator magnacore wires best 12.47 @114.9 1.9060ft at 19psi
 

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What were the conditions of the two days? Temp? Humidity? Same track?

Go to a dyno, dyno the two mods back to back to see if you lost power, not track times that are weeks if not months apart.
 

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Discussion Starter · #3 ·
I realize that cond make a difference however Ive put over 65 runs on thed car and drive it everywhere and you can definatly feel somethings not right checked clamps hoses every thing checks out ?thank you for you input
 

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wel u would need a bigger turbo to really compenasate for the 3 inch i would guess but i may be wrong as my car is stock but the exhaust should help in the top end i would guess
 
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