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Old 07-11-2010, 05:07 PM   #1
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i have the following done to my 99 sse (k&n cold air intake, , msd coil packs, msd 8.5mm superconductor wires , dimondfire plugs,180 thurmostat, muffler back exhaust, zzp hv3 , zzp pcm tune,zzp throttle body,ER rockers,Ls6 valve springs, zzp pl) would i gain alot from a downpipe or should i just replace my cat with a free flowing one ?
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Old 07-11-2010, 05:25 PM   #2
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What is a muffler back exhaust?
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Old 07-11-2010, 10:40 PM   #3
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new from the muffler back its often called an axle back exhaust.
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Old 07-11-2010, 11:12 PM   #4
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That'* what I was thinking. Cat back is everything behind the cat, so when you said muffler back I was thinking you put new tips on.
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Old 07-12-2010, 07:57 AM   #5
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Our downpipes don't have as much of a restriction as say a W body. The biggest restriction is the front exhaust manifold. A Plog may be a better investment if you are looking to free up the exhaust.
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Old 07-12-2010, 05:45 PM   #6
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i already have a power log , and thought a high flow cat would help?
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Old 07-13-2010, 07:33 AM   #7
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It might, but don't expect anything noticeable from it...except a slightly louder exhaust.
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