VAREX Universal Oval Muffler 3" Inlet / 3" Tip (VMK11-300)

Varex Muffler / XForce Exhaust
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VAREX Universal Adjustable Muffler

VAREX™ mufflers utilize our patented* technology to combine both the design of the stock muffler and the performance muffler into one single compact unit. A sophisticated butterfly valve mechanism is implemented to redirect the exhaust gas flow and vary be-tween the two. For higher sound level, the exhaust flows are directed through the opening path and produces maximum power with a robust sound level (or the “sports car note”) and near-zero resistance.

Whilst for lower sound level, the exhaust flows are directed through the chambered path (similar design with the stock muffler), and produces minimum sound level that gives you the best in-car comfort. Angle of the valve is also controllable, which can be adjusted to stop at various points between sports mode and silence mode. This gives you further freedom to set the optimal sound level according to your desired preference.


  • STREET MODE - Setting your Varex muffler in ‘Street mode’ enables lower sound levels and maximum discretion, as exhaust gases are directed through a chambered path as would a ‘stock’ muffler
  • RACE MODE - For greater power output and sound level, exhaust gases are directed through the opening path and produce maximum power with a robust sound level (or the ‘sports car’ note) and near-zero resistance
  • IN BETWEEN - As the angle of the valve is adjustable, it can be adjusted to stop at various points between sports mode and silence mode. This gives you further freedom to set the optimal sound level according to your desired preference
  • Easy Installation, no hard-wiring required (in-car 12v socket included) for plug and play functionality
  • Durable construction with water resistant plugs
  • Dual mufflers control harness available
  • Stylish remote key pad


  • 3.0
  • 3
  • 3.0
  • 5.5
  • Single Wall
  • 6 x 10
  • 15


  • Universal

What's In The Box?

  • (1) Universal VAREX Muffler


  • Manufacturer Limited Warranty

Customer Reviews

Based on 4 reviews
Just making sure

Is the smart box a separate purchase? Does it need tuning?

Mickey Deez
Helpful Addition

This muffler was added as an axle back to my Evo 8 with a 3" turbo back with a Mil-Spec 100 cell high flow cat. I had an interesting outcome. At first, the axle back piping had a restrictive bend which positioned the muffler in a straight forward position. See photo on left. It was hard to distinguish with the valve open and closed but it was very quiet when closed. I was not satisfied with the performance loss at wide open throttle. Another fabrication shop removed the axle back bend making it a straighter pipe, slightly positioning the Varex muffler at an angle. Performance at WOT instantly came back. After driving for a few weeks, opening and closing the valve is audibly distinct. It sounds like turning a subwoofer on and off. The only thing I dislike is the moderate to intense level of drone but I fault it to my setup. Planning to add a Helmholtz or side branch resonator to ease the drone. I also have GSC S1 cams which lope fairly aggressive at idle, with the valve closed it sounds like machine gun farts. Overall satisfied with the purchase but this is not an end-all solution for quieting a loud Evo.

Good investment.

The package shipment got delayed a little bit, but it didn't bother me. Because they keeped me informed of what was going on at all times. That was good on their part. The muffler works awesome. Even on a 3'' complete straight-through turbo-back exhaust, it keeps me out of trouble.

Best of Both Worlds

Bought one of these mufflers (oval 3" in., 3"out.)from MAP months ago. Had a local shop help me fab it into a catback for my WRX. It works as advertised. Nice and quiet and refined when closed, and sporty and free flowing when open. It is nice to go quiet mode when the wife and kids are in the car. I don't have dyno numbers to back it up, but the car has two personalities now and has better power/response when the muffler is open and free flowing. I'm really satisfied with the quality, and I may buy another for another car I have. Only gripe is the price of the muffler. MAP is the only place that sells Xforce Varex mufflers in the US since Ive looked over the years.