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#1
08-31-2004, 01:34 PM
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hi flow cat.
new exhaust, running a 2.5" straight pipe to the factory y-split from a hi flow cat, and dual flowmaster 40 series mufflers. Got everything except for the cat. just wondering if anyone had ne suggestions as far as which cat. i should go with.
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#2
08-31-2004, 01:47 PM
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Try a Carsound cat made by Magnaflow and they have them @ Ebay....~Larry~
http://cgi.ebay.com/ebaymotors/ws/eB...category=33629
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 ClubGP Member 6530 Since 2001
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#3
08-31-2004, 04:55 PM
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Re: hi flow cat.
^^ I agree
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 2001 Pontiac Grand Prix GTP 1994 Pontiac Firebird Formula 1972 Pontiac GTO
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#4
09-01-2004, 12:36 PM
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Re: hi flow cat.
what is the stock diameter on the down pipe? because with the rt downpipe and cat, it is i think 3 in. and my local exaust shop could make one up for me if i got a high flow cat right? and also what is the best diameter to go with, i have a 2.5 in stright pipe, so would i be able to get away with a 3in down pipe and 3 in cat? and what am i looking at for gains?
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