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Registered
Join Date: Jan 2003
Location: Atlanta, GA
Posts: 1,127
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cat or test pipe?
Catalytic converter recently began making the little 'rattling sound' at certain rpms. So... I assume it is about time for its replacement. However, should I replace it or swap it out with a test pipe? I believe the price for each is about the same, so I guess my main question is, is there any difference?
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Brad Tompkins Current: '86 951 Sunroof Delete - '89 951 - '83 944 Spec - '08 Cayenne Turbo Past: '88 924S Track - '86 944 16v - '87 951 - '87 951 - '88 951S - '08 Cayman S - '87 944 Track - '93 968 |
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01-12-2003, 06:08 PM
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Join Date: Oct 2002
Location: Loveland, CO
Posts: 610
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a test pipe is just a straight through pipe, it just bypasses the cat and runs normal, pipe where the cat usually is, i have heard people say they get huge HP gains with test pipes on turbo cars, i bought a high flow cat off ebay for 40 bucks which is a step in between a restrictive cat converter and a test pipe, just get one of those, good luck
john |
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01-12-2003, 06:39 PM
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Join Date: Dec 2001
Location: New Jersey
Posts: 2,093
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Sweet, my CAT was doing that to, making a rattling noise at 3200rpms. Dude, you have an NA 944, you have to get a CAT becuase if you dont you WILL NOT pass inspection. Get a free flow CAT, they are pretty good. I got mine from amhet for like a 100 bucks. I was blowing rings of steam out the back when I first started the car up
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{1987}944S - (SOLD). Last edited by overkill; 01-12-2003 at 07:14 PM.. |
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01-12-2003, 07:11 PM
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Join Date: Oct 2002
Location: Loveland, CO
Posts: 610
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yah buy a high flow, but try to spend less than 50 bucks! Go on ebay and buy a carsound high flow cat, they are great, thats what i have it cost 41 dollars shipped!
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01-12-2003, 09:48 PM
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Join Date: Jul 2002
Location: Indy In.
Posts: 669
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I have a test pipe and I think it hurts low end torque while improving high end RPM power...I like it, my car sounds just a bit more throaty without being too loud! It depends on where you live...No inspections here in cold Indy...
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89 Porsche 944 Owner: AutoFreeFinders.com Online Auto Mall |
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01-13-2003, 07:37 AM
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Join Date: Dec 2001
Location: Cordova, TN
Posts: 1,222
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You can just gut the cat, and reinstall it. Make sure to use a mask and gloves. You probably wont pass a smog test. Poblem with a test pipe is you wont even pass the inspection. Even if there is no smog test it is illeagle to remove smog equipment.
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Roger Hall 81 924 N/A Some people are like Slinkies. Not really good for anything, but you still can't help but smile when you see one tumble down the stairs. |
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01-13-2003, 04:14 PM
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