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A cat-back exhaust is for sound. That's it. It might provide a hint of extra flow but a down pipe and EM is SOOOOO much better. I wish i had found this site before i bought my cat-back. I dont regret it....i love the sound but it's not needed.
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Tom
'05 WRX Wagon
Cobb AP Stg 2
"Wagon power baby!!!!"
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