Sep 182016
 

How to Do It

Tools Needed:

  • Exhaust Hanger Removal Pliers, or a plain old plumbing plier in our case
  • Exhaust Pipe Cutter
  • Ramps or jack stands to raise up the car

Time spent: 2.5 hours

Cost: $638.50 for the system from MountuneUSA.com including shipping and tax.

Here is the Process

Disclaimer

Use the information here at your own risk. We take no responsibility and will not be held accountable for any safety issues, or any problems whatsoever. If you are not mechanically talented or never open a hood before, please do not try this on your own. Seek help.

      1. Raise the car. Place on jack stands or in our case, Race Ramps.
      2. Make sure the exhaust is cool to the touch.
      3. Spray a little WD-40 on the stock insulators (total 4) to ease removal effort.
      4. Locate the straight section of pipe just ahead of the torsion beam next to the fuel tank. Use exhaust cutter to separate the system.
      5. Remove the muffler. By first remove the insulator closer to the torsion beam by slightly lifting up the muffler by hand to take weight off of the insulator. Twist and pull the insulator away from the hanger. We find it easier to unhook the top hanger first.
      6. Unbolt the two 13mm nuts at the downpipe, and unhook midpipe from exhaust insulators.
      7. Reinstall original multi-layer metal gasket at downpipe. The supplied flexible exhaust gasket does not fit stock downpipe.
      8. Install Mountune midpipe. First slide midpipe onto downpipe studs. Hand tight the two 13mm nuts. Re-hook exhaust insulators. Tighten the nuts to about 30 lb-ft. No need to overtighten.
      9. Slide the slip fit elbow pipe onto the midpipe. Don’t fully insert as you will need to turn it a bit to adjust for muffler fitment in terms of tilt.
      10. Place Mountune exhaust clamps on the elbow pipe. Keep them loose.
      11. Install Mountune muffler. By first lube up the hanger holes of the insulators with a little WD-40. Install the insulators first on the top hanger using the plier. The most challenging part is to get the insulator through the initial bulged part of the hanger.
      12. Connect the muffler hanger to the insulators. And to the elbow pipe.
      13. Twist and turn the elbow pipe to adjust for degree of muffler tilt. The system should be fitted in such a way that it will not contact any part of the underbody. All exhaust insulators are at the natural position (pointing straight down, and taking tensile loading from the weight of the exhaust system only) while the muffler tips are evenly spaced in the bumper cutout.
      14. Base on the above fitment principle, press elbow pipe snugly into the midpipe and muffler. The more they are compressed, the further the tips will go inward of the bumper cutout.
      15. Once the fitment is finalized. Slide the exhaust clamps onto each connection at the elbow pipe and tighten with 13-mm socket and wrench.
      16. Double check undercar fitment.
      17. Start the engine. While admiring your work, check for exhaust leak at downpipe gasket and particularly at the exhaust clamps at the elbow pipe.
      18. Lower car back on ground. Take a test drive to check for abnormal sound.
      19. And admire more. Done.



Impression

At idle, the interior sound level is only marginally increased. The exterior exhaust tone has rich deep rumbles for a little 4-banger. The exterior sound level is about 50% louder than stock system. A jab on the throttle in neutral, engine seems to rev slightly faster than before. You can almost sense the movement of the exhaust flow from the crisper and throatier exhaust note. Turbo spooling and blow off valve are more announced as well.

Under acceleration, though Mountune didn’t publish any data on power gains, our butt dyno suggests at least 5hp is gained throughout the power band with our MP215 tune. The engine also pulls harder toward redline than before. Backing off the throttle, the exhaust snaps and crackles in lovely way. Some pops and backfires at high revs can be heard with window down.

There is absolutely no drone at any cruising speed. The system is well-engineered from idle to full throttle and anything in between.

The only drawback in our case is the exhaust tips rubbing against the bumper cutout with stock exhaust isolators. We alleviated the issue with longer and stiffer isolators (here).

Exhaust Note Comparisons

Lamzgarage Health Tip

We have done all the research for you. Look no further. This Mountune High Flow Exhaust system is one of the most well-rounded exhaust systems out there. LZG

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