View Full Version : Dynomax Super Turbo Muffler O/C

August 20th, 2006, 01:19 AM
Well this muffler does as the ads say. Quiet yet Performance. I agree it is quiet, but some performance is missing. Off the line it takes awhile to get some flow, feels like a laggy turbo off the line, then a couple seconds you have power.

Id say this muffler deserves a 4 out of 5. It was what I was looking for, something mean at high revs, but neighboor hood friendly at low revs.

Pics and Videos:
http://i39.photobucket.com/albums/e172/XJoshua/th_70e52c3c.jpg (http://s39.photobucket.com/albums/e172/XJoshua/?action=view&current=70e52c3c.flv)

After(Headers, No Cat, Dynomax S/T)-
http://i39.photobucket.com/albums/e172/XJoshua/th_fd351ea1.jpg (http://s39.photobucket.com/albums/e172/XJoshua/?action=view&current=fd351ea1.flv)


August 20th, 2006, 03:11 PM
Did you try driving your Jeep without a muffler first so see if this muffler was the cause of the lack-of-acceleration off the line?

What is the warranty on this muffler?

August 20th, 2006, 03:38 PM
I drove open manifold for two weeks, and it ran like a champ, just shift points held a little longer. With this muffler the shift point are right on target.

A guy on JF said the problem might just be the fiber cloth on the inside of the muffler not being broken in yet, and that in a week or less, Ill have all acceleration back. Also if that doesnt help, just get a TB spacer to get some more air in.

August 20th, 2006, 10:09 PM
Something you may wanna try is to actually run a tailpipe. Sometime if an exhaust is too freeflowing you will lose some of that bottom end torque, a tailpipe with the hump over the axle may bring back some of that torque. But that wouldn't explain it running better w/o a muffler. Maybe the noise fooled you into thinking it was running better than it actually was?

August 20th, 2006, 11:10 PM
Well the whole reason I chopped my exhaust was because my cat was clogged, and the baffels in my previous muffler were smashed.

Already after two days of running this new muffler Im feeling it runs better. The torque seems to be comming back, my off the line has improved since I put it on. The reason Im running the S/T muffler and a short tail pipe is because the S/T has the "S" shapped internals to make up for not having a tail pipe.

Couple more days and it should run like brand new. Throttle responce, and kick downs are working wounders, and havent overheated as much.

August 21st, 2006, 11:44 AM
My guess would be because your running it without cat...

My XJ was a TURD when i ran it without the cat...put a cheap autozone special cat on it and it ran GREAT!

August 21st, 2006, 04:27 PM
Put the cat back in - we've already gone over that one many a time.

I've never heard of a break-in period on a new muffler...

August 22nd, 2006, 03:49 PM
I have plans to put a cat back on, but no time soon. Everything is running grand now. I had to install another intake exhaust gasket. It ran fine after that then I replaced all the the vacum lines since they were pretty beat up. Still have a few that I need to find a place for.

UPDATE: Failing accleration has been determined to be several sensor failures. My TPS recently has begun to fail(bucking, stalling, poor milage), so I bought a bunch of sensors, and also got me a new dash cluster so I can see what RPMs Im actually running at.