Official Flowmaster on 4 cyl thread -
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Unread 11-27-2006, 07:30 AM   #1
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Join Date: Apr 2004
Location: White Plains, NY
Posts: 243
Official Flowmaster on 4 cyl thread

So I got my flowmaster 40 deltaflow muffler installed this weekend. PN: 942442. $67 online, and this is my experience so far.

Installation: The muffler is shorter than the oem muffler so the shop installed about a 5" extension on to the tail pipe. The cost for the installation was $40 from Mieneke.

Sound: When I first got in it and drove away my stomach dropped and the first thing that came to my head was, "Man I hope this doesn't sound like a honda civic". So anyway I drove it home and as soon as I got outside of my Jeep the my thoughts changed completely. From the outside it sounds good. Deep, not 8 cyl deep but far, far from sounding like a civic. I had my friend drive it around the block and definitely sounds good.

Interior noise is louder, but only between 2,225 to 2,750 range. At idle its not loud and on the highway you can't even hear it.

Driving: Obviously I wasn't expecting huge gains from installing this, and if you do...., so with that clear, I must say on the highway I did notice more umph going up hills. It seemed like I had a little more power in 5th. I can honestly say this because I drove home 2 hrs on Thursday before the install and did the same trip back after the install.

Verdict: I would definitely recommend putting a flowmaster on a 4 cylinder. At a cost of $107 parts and labor it is definitely worth it.

Hope this helps anybody thinking about installing one.


Keep it Real Ol' XJ and TJ

"Many men go fishing all of their lives without knowing that it is not fish they are after."
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Unread 11-27-2006, 07:36 AM   #2
Jerry All-Bran
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Join Date: Dec 2004
Location: Escondido, California
Posts: 658
x2 on the umph. I noticed smoother shifting more than any power difference.
And here is a video clip of my Flowmaster Super 40 on a 4cyl.

Don't forget, it has to be worn in a bit....mine has 40 000km at the very least.

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Unread 11-27-2006, 09:54 AM   #3
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1997 TJ Wrangler 
Join Date: Dec 2005
Location: EightSixFour
Posts: 708
Finally a 4cyl does it. Do you think it would sound like crap if i put a turn down right after the muffler or skid plate?
97 TJ
98 Taco
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