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Unread 09-10-2013, 02:40 PM   #1
Chase0808
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2001 TJ Wrangler 
 
Join Date: Nov 2012
Location: , Georgia
Posts: 212
Flowmaster 40

I recently purchased a flowmaster 40 off of Craigslist. It looks great and I ant wait to get it on. It is a dual exhaust and I didn't want to make mine a dual. I was wondering if there is a way to change the muffler into a single instead of dual. Will there be back pressure problems?

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Unread 09-10-2013, 07:16 PM   #2
SoNova
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1989 YJ Wrangler 
 
Join Date: Jun 2013
Location: Trenton, Florida
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Chase0808, I will probably get torn apart for this answer but I did the same thing on my YJ. My muffler rusted off and the day I cut it off a friend gave me a flowmaster 40 that he cut off of his truck. Being broke and in need of a muffler I welded it on. The length was almost the same as stock but the inlet and out tubes on the 40 were considerably larger. I just pie cut the muffler openings and reduced them down then welded the pies up then welded the muffler on. Then I just welded a plate over the second opening and off I went. As far as the backpressure goes I am not an expert but I will tell you I have run it that way for around 6 or 7 years and haven't noticed any problems. It looks kind of back woods redneck, but I was in a hard spot and I did it for the cost of a couple feet of welding wire, besides looks (especially underneath) don't make my jeep perform any different. I just used what I had to get it back on the road, plus it sounds better than the stock muffler and everyone knows sound adds horsepower right?
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Unread 09-11-2013, 04:52 AM   #3
superj
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1987 YJ Wrangler 
 
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my flowmaster sounds great too. no idea on anything about it because it was hanging underneath and not hooked up when i bought the jeep but a local shop welded it up nice and pretty and its been that way for years now. cover the opening like mentioned above and ride
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Unread 09-11-2013, 06:45 AM   #4
Kuntryboy816
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1989 YJ Wrangler 
 
Join Date: Jul 2010
Location: Newark, Dela"where"
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Quote:
Originally Posted by SoNova View Post
...and everyone knows sound adds horsepower right?
Same principle as swag stickers....
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Unread 09-11-2013, 09:08 AM   #5
Chase0808
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2001 TJ Wrangler 
 
Join Date: Nov 2012
Location: , Georgia
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Would I be able to use something like this to turn the dual exhaust into a single without negatively affecting anything?

image-2794670632.jpg

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Unread 09-11-2013, 10:07 AM   #6
SeanB95YJ
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1995 YJ Wrangler 
 
Join Date: Nov 2009
Location: Schenectady, New York
Posts: 1,185
you could as long as you can get the inlets/outlets in a size to match your current pipe & muffler

only potential problem I see is that USUALLY that type of pipe is intended as a traditional Y-pipe... 2 pipes going in and a single outlet. in that case, the outlet is usually the same size (or more likely larger) than each of the inlets.... your situation I imagine would be reversed.

check Summit or Jegs for the best selection of sizes on that

Good luck
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[FONT="Comic Sans MS"][COLOR="Blue"]Sean B. - Schenectady, NY - 95 YJ, 350/700r4/NP241, JB Shorty SYE, 8.8 rear, 2" BDS, 1" homebrew shackles, Daystar 1" BL, TJ flares, 35x12.50 General Grabber AT2 on 15x10 Bart D-Truckers, Polyshield polycarbonate windshield, HD over/under crossover steering
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