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Old 06-09-2004, 10:15 PM
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Do I have enough back pressure?

I have a 1987 Z28 and I want to beef it up as much as i can and as cheep as i can. I want t put a whole new exhaust on it. I was thinking i would get headman headers with a flowmaster header back exhaust and put moroso spiral flow mufflers on it. I was also thinking about running pipes from the headers to glass packs and out the back. Would not having mufflers and only having just glass packs provide enough back pressure or should i go with mufflers. I want the most power i can get but i don't want to hurt my engine. I'm sure that a lot of you have heard questions similar to this and know a lot about it .

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Old 06-09-2004, 10:40 PM
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Don't know that glasspacks will fit. I would stick with the mufflers.
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Old 06-09-2004, 10:43 PM
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How???

How would glass packs not fit i don't get it
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Old 06-09-2004, 11:36 PM
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Any muffler will fit, glasspacks actually restrict flow on average more than a chambered muffler.

Stick with a chambered "turbo" muffler and if you want that low rumble without the rasp use a glasspack after the muffler, they typically call them resonators at the exhaust shop. Don't be stuck on brand just for that "patented sound", I prefer to go with whats on the aftermarket noname brand that the local shop has in stock. My SHO has two Neon resonators on it, works great!

Muffler gains are usually 10 HP or less between brands except on highly modified engines where the engineering counts at rpm. Don't go crazy spending money on exhaust parts, it all rots away in the end.
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Old 06-10-2004, 12:40 AM
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I've looked into this as well, and from what I have read, any backpressure at all is actually bad for power. Of course if you are building a street legal car (and I believe you are) noise restrictions would most likely park your car.
http://victorylibrary.com/mopar/header-tech-c.htm

Heres a site I found on exhaust info.


bonuts
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