Flowmaster 40 - JeepForum.com

 
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post #1 of 6 Old 09-10-2013, 03:40 PM Thread Starter
Chase0808
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2001 TJ Wrangler 
 
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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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post #2 of 6 Old 09-10-2013, 08:16 PM
SoNova
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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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post #3 of 6 Old 09-11-2013, 05:52 AM
superj
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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

I don't feel like working on anything at this time so i sold my yj.
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post #4 of 6 Old 09-11-2013, 07:45 AM
Kuntryboy816
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Quote:
Originally Posted by SoNova View Post
...and everyone knows sound adds horsepower right?
Same principle as swag stickers....

Quote:
Originally Posted by 14Sport View Post
Until you know exactly what is underneath the, well, not really sure what to call them...mistakes...it's hard to come up with a plan of action.
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post #5 of 6 Old 09-11-2013, 10:08 AM Thread Starter
Chase0808
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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?

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Sent from my YJ
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post #6 of 6 Old 09-11-2013, 11:07 AM
SeanB95YJ
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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

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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