best exhaust setup for improving mpg
#63
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Year: 1988
Model: Cherokee
Engine: AMC242
However, I was just pulling out a number - I wasn't even crunching numbers. Call it hyperbole, it's probably less of an exaggeration than some of the really pointless stuff I've seen ricebois do...
(If I mean to give a definitive answer to something, don't worry - I'll show my work... )
#64
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Year: 1999 Sport Road Rash Monstaliner
Model: Cherokee
Engine: 4.0L I6 Power Tech Engine
Got my gear installed today. The magnaflow is noticably louder but has a nice mean rumble. I stripped the threads removing the downstream o2 so that needs replaced. I did nothing with the stock downpipe and just kept it. Added a flex pipe right before the cat. For the o2 i just disconnected it until i get a new one and plugged the new cat's port for now. Did not throw a CEL which I thought was surprising. Hopefully mpgs improve!
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Anthony Beaudoin (05-12-2022)
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Year: 1998 Classic (I'll get it running soon....) and 02 Grand
Model: Cherokee (XJ)
Engine: 4.0
- Bigger isn't always better.
- Exhaust systems are about science, not size.
- Ideal is probably in between 2.25 and 2.5, ergo,
- You won't hurt anything by going 2.5, and,
- You probably won't see any magical gains, either.
- Unless you are going to install a complete performance system (headers to tailpipe), engineered for this particular application by people who actual know what they are doing, you probably aren't going to see much difference.
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Anthony Beaudoin (05-12-2022)
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