Flowmaster muffler
#1
12-02-2007, 01:24 PM
Flowmaster muffler
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 thenI ended up cracking my engine block/blown headgasket, one of the twoI 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.
#2
12-02-2007, 02:43 PM
RE: Flowmaster muffler
I always thought that less backpressure is a good thing and improves performance..
#4
12-02-2007, 05:11 PM
RE: Flowmaster muffler
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.
#5
12-02-2007, 07:38 PM
RE: Flowmaster muffler
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'.)
#6
12-02-2007, 09:44 PM
RE: Flowmaster muffler
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 thenI ended up cracking my engine block/blown headgasket, one of the twoI 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.
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 thenI ended up cracking my engine block/blown headgasket, one of the twoI 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 also agree with rriddle3on that mechanic if that is whatyour mechanic really determined.
#7
12-03-2007, 10:40 AM
RE: Flowmaster muffler
<new muffler and no cat and my engine is fine almost a year later.
#10
12-03-2007, 04:55 PM
RE: Flowmaster muffler
Wow, that exhaust sounds a lot like a roof flexing with a bangin' system in it...
