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any idea on HP gains???

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Old 06-26-02, 01:08 PM
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any idea on HP gains???
i put a custom exhaust on my 87 na and i was wondering what the HP gains were... 2.5 DP, no pre cats, straight through brand new main cat, 2.25 pipe to a single straight through muffler. (and i can shoot flames now!!! hell yea!!!
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Old 06-26-02, 01:10 PM
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Prolly like a 25-30 hp gain.. It's basically a full straight through exhaust
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Old 06-26-02, 01:12 PM
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If it still has the stock main cat, I don't think he is going to see a 25 horsepower gain.
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Old 06-26-02, 01:19 PM
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is the brand new cat an oem replacement or a performance
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Old 06-26-02, 01:21 PM
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Oh, a FUNCTIONAL cat... well then prolly 15hp. Get a staright pipe and swap in a real cat everytime you have to get emmissions checked
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Old 06-26-02, 01:26 PM
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performance cat
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Old 06-26-02, 01:41 PM
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then maybe i would say 20 then... ditch the cat but have something put in(like said above) if u have emmisions!
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