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What kind of gains am I looking at?

Old 11-15-2003, 11:47 PM
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Don't mean to take over the post, but how much is install on a muffler and hi-flow cat?
Old 11-16-2003, 12:36 AM
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I paid $40 bucks to have my cat installed and i believe I paid $125 for my muffler and tips and installation.
Old 11-16-2003, 09:56 AM
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if you have access to a welder and a cutting torch you can do it yourself.
Old 11-16-2003, 11:49 AM
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you don't even really need a cutting torch..... I've done it with a Sawzall
Old 11-16-2003, 06:03 PM
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Originally Posted by Glasuan
I think no one has answered his main question of gains. I believe it is usually in the neighborhood of 10-15 hp from exhaust mods. With a full catback system it goes up to 25 hp or so. BTW, if you put on stickers thats an extra 25 hp alone, as no one will want to race you
I think those numbers are a lil high for our motors. Sometimes you dont gain any horsepower when you put a high flow cat on. If you just change out the muffler & cat you might see 10hp. But then again the only way we will really know is if you get the car dynoed.
Old 11-18-2003, 01:25 AM
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Before full exhaust replacement on GPGT:-15.457@88.17mph

After:
zzp ported manifolds=$250.00 bucks
2.5 custom downpipe/-w-
Carsound "Magnaflow" hi-flo cat=$70.00+$45.00 for instalation(included downpipe)
2.5 cat back=$100.00
original u-bend and resonator delete=$60.00
Sumitt turbo muffler=$15.00
total=$540-(minus the 60 that the bonne won't need for u-bend delete)

new time in the quarter= 15.088@90.20mph

mind you this is on aa N/A engine. Hope this helps with your question.
Old 11-18-2003, 02:37 AM
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Funky makes a good point. Good exhaust work will net more HP on a SC car than a NA.
Old 11-18-2003, 10:24 AM
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I really like this site i dont really know anyone who has a bonny besides me and i read all your posts and stuff and im learning myself i was going to add a topic just like this about the muffler and the high flo cat and now i didnt have too thanx
Old 11-19-2003, 03:29 AM
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Hey Funky did you run that fast including your stage one kit?

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