do i realy need a cat back ? - Page 2 - Subaru WRX Forum
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post #16 of 18 Old 04-17-2005, 06:54 PM
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One of the bigger tuners (I believe it was Vishnu, but I'm not sure) did a series of dyno tests not long ago. They tested stock cars, catless cars, cars with bigger turbos, etc. They tested them with the stock muffler and with aftermarket mufflers. The largest gains was 4 hp from one muffler. Most were 2-3.

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post #17 of 18 Old 04-23-2005, 10:16 PM
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hot damn that borla hush sounds good, i knew i wanted a borla but i never heared of the hush model

how does this list sound?

Helix up/down pipe combo, high flow cat, and borla hush(gonna be mad expensive though!)
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post #18 of 18 Old 04-24-2005, 07:08 PM
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you should go cat back AND NOT maganflow or flowmasters we are driving WRX's here not mustangs and camarros. Id recommend Invidia or stomung or APS is ridic
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