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Old 07-25-2011, 06:28 PM   #8
El Supracabras
3" Exhaust
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Join Date: Feb 2010
Location: Chicago
Posts: 240
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Using a test pipe is a good idea. They were designed to prevent expensive catalyst damage during tuning and racing and are not intended to replace the cat permanently. They are technically only legal off road regardless of state emission testing. Once the car has been tuned well, you can install a good hi-flowing catalyst. You should notice little to no decrease in power and the cat should last awhile.
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