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Old 08-16-2002, 12:37 AM   #1
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Default taking off your cat worth it?

I know youll get more hp but doesnt it make your exhaust smell bad? would getting a high flow cat have any noticable hp gain? gimme your opinions. thanks
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Old 08-16-2002, 08:38 AM   #2
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no, your exhaust won't smell bad. you'll just smell some unburnt fuel. you shouldn't be back there sniffing it anyway. a high flow cat should help if it's a bottle neck in the system after you replace the header, pipe after the cat, and muffler.
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Old 08-16-2002, 10:50 AM   #3
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On my old '97 SL2 I had the headers, SPS cat-back exhaust, and a Flowmaster Delta Muffler. I also had a flanged straight-pipe made where I could unbolt the cat and slip in the straight-pipe for "off-road" purposes.

After deleting cat: Exhaust smelled great like old muscle cars, noticeably louder exhaust, about 0.2 sec quicker in the 1/4 mile (measured at a dragstrip), and improved fuel economy on the highway by 2-3MPG at 70MPH. It passed emissions to (although the NO emissions were borderline high).

Just remember this is illegal and should not be used on the street.
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