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Old 03-23-2004, 03:36 PM   #1
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I bought a Flowmaster 40 series to replace my main muffler (which I removed a few months ago) but it was a bit to big. I have to buy another 40 series so I can replace my dual mufflers. I'm looing for a deep, aggressive tone. In the meantime I have straight pipes. It sounds raw, especially when it idles, but after any aggressive acceleration if I take my foot off the gas too quick, it backfires (humiliating). What causes this, and how do I fix it before I get my other 40 series (might be a while)?
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Old 03-23-2004, 03:58 PM   #2
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My guess is your removing backpressure so the engine is running a bit leaner. A backfire occurs when unburnt fuel is sent through the exhaust system and then ignites.

Here is a page of info on it...

http://faq.f650.com/FAQs/BackfiringFAQ.htm
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Old 03-23-2004, 09:02 PM   #3
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Is it a flowmaster 40 for the f bodies? Or is it a G body/W body unit?
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Old 03-24-2004, 12:33 PM   #4
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I was told directly by Flowmaster that I should go with a 50'* series, and warned that it may have a harsh, irritating sound from the supercharger and strange timing of the 3800. Try calling them...they're great...they might be able to help you figure out what to do.
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Old 03-24-2004, 02:03 PM   #5
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There is no cheap fix unless you get a used muffler and a temp install (clamps).
The unburnt fuel and back firing can cause problems with the cat and valves etc and should be addressed soon.
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