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blk13 · 09-17-2013, 10:05 PM

Was this with or with out cats? whats the horsepower difference if I was to run the cats with these headers.

09-17-2013, 10:05 PM	#24
blk13 Drives: 2013 zl1 Join Date: Sep 2013 Location: Missouri Posts: 298	Was this with or with out cats? whats the horsepower difference if I was to run the cats with these headers.