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Old 08-01-2003, 12:19 AM
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Unhappy No Back Presure

Hey, I have a 2000 Z28. If I take off my cats and muffler so that I have no back presure will that improve performance, or will it damage my engine. Am I better off just breaking down and buying a FlowMaster. I dont know what to do. Some Help!

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Old 08-01-2003, 12:49 AM
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there are many companies that offer after cat converter systems that will help your Z flow better exhaust wise, such as flowmaster, dynomax and others.
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Old 08-01-2003, 02:38 AM
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There are a ton of systems for those cars. Spend the money on a good legal exhaust and you'll be quicker, legal and good to the land!
The new systems are so good you will make more power than thought possible!
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Old 08-01-2003, 08:28 AM
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BigPerm (I love that Friday Movie!)
What are you trying to do with car? Are you thinking of running headers out on the street? If so, it's a big no-no . For one, it's too loud (as if there's such a thing) and you would get busted by the first cop within a 2 block radius. Number two, you'll loose most of your low end torque. If you're only planning on doing at the track on race day, that's not a problem, unless your track has some sort of muffler rule. Either way, do like DV and Sandflea say and get a cat-back system. You'll get a nice sound, and great flow on and off the track.
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Old 08-01-2003, 02:59 PM
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Please go to this site and read ...The Exhaust Pulse
Luv the smell of NITRO in the morning.
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Old 08-02-2003, 05:20 AM
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I work at a chevy dealer and have seen so many problems relating to exhaust systems or the lack of it is unreal. One nut actualy brought it in to have his check engine light turned off and the rattle underneath fixed after he had the entire exhaust system replaced with straight duals and no cats. Imagine his response when we told him the whole warranty just got voided. on a modern computer controlled engine and trans it can change shift points, mess with air fuel ratio, cause all kinds of idle problems and also slow it way down. I would suggest just leaving it stock on a 2000 but if you must change it just do a cat back. You have after cat oxygen sensors that will know the converters are missing and they will lean the crap out of your motor trying to get it in spec. That is not a good thing at all.
One of my customers took the cats off his k3500 dually and was upset when it couldn't pull itself up a hill anymore. some freind of his told him it would make it go fast. Wrong. It leaned it out to the point of burning valves. He ruined the engine and had to pay for it himself. It voided the warranty also.
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