all muffler and exhaust questions go here!!!!!!
#3782
Alright I stripped the threads to an o2 sensor and am driving without one right now and getting 15.5 mpg, if I replace cat with high flow and install new sensor how mich improvement am I looking at?
#3788
Senior Member
Anyone have a Magnaflow Direct fit cat and a Flowmaster Super 44 setup? I am picking up the cat tomorrow and have had the muffler for a while. Just wondering how the sound was.
#3790
CF Veteran
Join Date: Sep 2011
Location: Frederick, MD
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Year: 1989
Model: Cherokee
Engine: 4.0
#3791
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Join Date: Dec 2012
Location: York, PA
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Year: 1998
Model: Cherokee
Engine: 4.0
Getting a good Christmas bonus this year and thinking of getting a full exhaust. What's the dirt cheapest high-flow cat, Flowmaster 40 and piping kit I can get ????
#3792
Senior Member
#3793
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Location: Frederick, MD
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Year: 1989
Model: Cherokee
Engine: 4.0
#3795
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Join Date: Nov 2011
Location: Northern MN
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Year: 1990
Model: Cherokee (XJ)
Engine: Renix 4.0
If you want to spend all that money on a FM40, PC also has a muffler and tailpipe kit for around $150 shipped. Or, you could get a Thrush welded for $25-40 and have a tailpipe made at a shop and it would be made to clear any suspension mods you might have.
FM+Tailpipe: http://performance-curve.com/84-01ch...ailpipe-1.aspx
Thrush:
Here's my thrush system: