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Re: Does a High Flow Cat. Converter add hp??
The hi-flow cat will lose you about 5 RWHP over a straight pipe.
A hi-flow cat will gain 3-4 RWHP over the stock cats.
You have two cats. One for each side of the motor. $70 a cat is CHEAP!!
Best spark plugs for the LS1....NGK TR55's.
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1999 Pontiac Trans Am WS.6 #1747
Stock'ish'
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