TPC just shipped me this kit to run the GT3 center muffler cup style with just the lower chamber, I’ll report back on how loud it’ll be...

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Just installed the tpc kit, some of the bolts/nuts for the bracket weren’t playing nicely so I had to get a different set of bolts to mount the bracket to the exhaust. Make sure you guys have the oem gt3 bracket because that’s needed to mount the exhaust to the tpc bracket. Driver side elbow pipe slid right in, passenger side needed a lot of persuasion to get the elbow to slide over the mid pipe end.

If you have a vorsteiner diffuser, you will have fitment issues, the bottom of the muffler is touching the diffuser. I will probably have to cut a bit of the diffuser out.

This is the valveless cupstyle version that only uses the lower chambers similar to the spmotorsports gt4 in the video above. On cold startup, it’s LOUD. Haven’t driven yet so will come back with impressions.

Haven’t cut anything on it yet, don’t have a cutting tool. Will probably just see if it melts off!? Its probably 1x5 inches on each side of cutting to have it all clear.

how heat resistance is carbon fiber? I’m not too worried about it because my diffuser is already beat up from track use.

Driving impressions: LOUD. Downshifts are LOUD. WOT is down right scary LOUD.

Sounds like a race car, sounds like a cup car. Has that throaty high note sound when in the upper revs. If cruising, 4/5th gear provide no drone. Other gears there’s drone with light throttle

for the lack of my own videos, I believe it’s like a mini version of this, but more rough and low end notes added in, a little bit less high notes due to not being able to rev to 9k







Will probably get the valves eventually.

Here’s how it sounds coming down the straight at buttonwillow.