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Old 06-02-2003, 18:49   #1 (permalink)
eheidrich
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Question 89ProbeGT exhaust questions????

I recently purchased a 89 probe gt turbo. It needed a clutch, so I had a Centerforce stage one that I purchased off the internet put in.

It also needs exhaust, so I ordered a Pacesetter Monza catback system. The system is 2/3/8 in mandrel bent.

My question is whether removing the catalytic converter will hamper performance, or if it will help free airflow. I do not have to worry about emmissions testing where I live, but I want to make the car faster not slower. I am using the stock headers that were wrapped when I purchased the car.
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Old 06-09-2003, 07:20   #2 (permalink)
sticky24
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about removing that cat, i would not recommend it, you need the back pressure that the cat will supply, plus if you have the turbo, the cat comes in handy, u can do it, but i would not recommend it
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Old 06-09-2003, 07:26   #3 (permalink)
sticky24
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and about having the headers wrapped, i will see if i can find that site that i have about what happens to ppl that wrap their headers, you only wanna wrap your headers when u are only using it for racing! people have done that, and it melts the wrap and put holes in the header
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Old 06-11-2003, 20:38   #4 (permalink)
eheidrich
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I wouldn't recommend wrapping the headers either. The guy I bought the car off of had the entire downtube wrapped down to the cat.

When I started taking things apart, tons of metal dust fell out from where the exhaust wrap was.

I had heard that it can stay moist, and therefore rust/corrode the metal underneath it.

Anyone know if a high-flow cat would be any better/worse???
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Old 08-25-2003, 02:57   #5 (permalink)
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With your car, you have a turbo, so less backpressure is good. Just removing and replacing your cat with a straight pipe is not going to cause a dramatic loss in back pressure, the exhaust system and stock header will provide plenty. With a naturally aspirated car this is more of a concern, but you have a turbo so freeing up the exhaust as most as possible is the way to go. You could see a 2PSI gain on your turbo by replacing the exhaust with larger piping from the downpipe back. If you replace the downpipe as well and do a full cat-less turbo-back exhaust you can see 20hp easily.
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