Flowmaster muffler
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Flowmaster muffler - 12/2/2007 11:24:11 AM
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RCarp48
Posts: 68
Joined: 12/25/2006
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So I have a 200 Trailblazer with 145000 miles. I got a flowmaster 40 series put on about a 3 months ago and all of the sudden my gas milage was gettin robber and then I ended up cracking my engine block/blown headgasket, one of the two I guess. So i had to get my engine replaced and i had a mechanic tell me there is probably no back pressure in it. So i was wondering if i should replace it with the stock or is this not even a problem?? Because if it is i would like to change it up so i can save my new engine.
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RE: Flowmaster muffler - 12/2/2007 12:43:23 PM
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Idriveachevy
Posts: 909
Joined: 10/9/2007
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I always thought that less backpressure is a good thing and improves performance..
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RE: Flowmaster muffler - 12/2/2007 2:54:52 PM
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Jharper
Posts: 1281
Joined: 11/9/2007
From: Michigan
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was it running leaner or richer? because usually, well i thought, that you want less back pressure.
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RE: Flowmaster muffler - 12/2/2007 3:11:05 PM
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lennyblazer
Posts: 1988
Joined: 5/6/2007
From: Appleton, WI / Houghton, MI
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Less back pressure is good in certain applications. Our trucks are sensitive to the amount of back pressure in the system. I am not sure if your particular application caused this or that your engine is just old and was going to need replacing. I would look at the exhaust question pages and see what size pipe and mufflers people are running. My guess is you have too large of pipe if you upgraded that. Otherwise if you just switched mufflers you should be fine. I hope someone else can help you out too.
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RE: Flowmaster muffler - 12/2/2007 5:38:40 PM
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rriddle3
Posts: 1545
Joined: 12/22/2006
From: Fort Worth,Texas
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No, the muffler had nothing to do with your previous engine's failure. If your mechanic couldn't tell you whether it was a cracked block or blown gasket, you might seriously consider switching mechanics. When you installed the Flowmaster, if you kept the stock diameter (2.25") pipes, or even went up to a 2.5" diameter, your should not have to worry about exhaust scavenging (what most people are referring to by 'backpressue'.)
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RE: Flowmaster muffler - 12/2/2007 7:44:53 PM
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Mr Blazer LT
Posts: 282
Joined: 12/19/2006
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quote:
ORIGINAL: RCarp48
So I have a 200 Trailblazer with 145000 miles. I got a flowmaster 40 series put on about a 3 months ago and all of the sudden my gas milage was gettin robber and then I ended up cracking my engine block/blown headgasket, one of the two I guess. So i had to get my engine replaced and i had a mechanic tell me there is probably no back pressure in it. So i was wondering if i should replace it with the stock or is this not even a problem?? Because if it is i would like to change it up so i can save my new engine.
I think it is much better to say you want to have "the right" amount of backpressure instead of less backpressure. You definitely don't wanna go too low on backpressure or it will hurt performance, if anything. Never heard of it causing an engine to blow. Even if it is possible, wouldn't the odds be like in the millions?
I also agree with rriddle3 on that mechanic if that is what your mechanic really determined.
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RE: Flowmaster muffler - 12/3/2007 8:40:35 AM
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blazinloud
Posts: 2463
Joined: 2/8/2006
From: Saskatoon, Canada
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<new muffler and no cat and my engine is fine almost a year later.
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Printable Version
also that was with my old alpine, only 550rms 
