I installed the Thermal R&D Catback today. The Bad: The fit of the mid-pipe was not spot on. It took me over an hour to get it onto the bolts on the cats. There is a whistle which I assume is an exhaust leak. I think that might be the noise we hear in Thermal's video when the revs come down, which is also the only time I hear it. (I'm new to TT cars, could this be increased noise coming from the turbos?) Interestingly I just went out and drove the car again and I didn't hear the whistling at all. It's heavier than the stock exhaust. The weight of the stock catback is 56.8lbs. the weight of Thermal's catback is 61.4lbs. It's impossible to get an accurate depiction of the sound. I tried my Sony A6000 and my cell phone and the results were equally shitty. I have new respect for people who make good audio quality exhaust videos. The Good: I absolutely didn't want a loud exhaust. I wanted to free up any restrictions in the stock catback to make my go fast foot happier. The sound is (I'd guess) only 10% louder than stock. It now has a really deep note that almost sounds like it's coming from a sub-woofer. The deep note is there from low RPMs and gets more "screamy" in the higher ranges. It's amazing! I made a video going from 50-55-60-65-70mph, letting cruise regulate the RPMs between each increase. There is no drone! None! Zero! When the car gets up to speed and the driver or cruise control settles in there is no noticeable sound from the exhaust. My butt dyno is telling me there is a power increase. There is a noticeable increase in low end torque and the throttle response feels better (I guess these two things go hand-in-hand). TLDR: If you buy it you might be better off having someone else install it. Have the mid-pipe and axleback welded together (assuming there's a leak I'm experiencing). Don't expect a weight savings. It's louder, but NOT LOUD. The exhaust note is very deep...like "feel it in your chest" deep. As promised by @Thermal there is no drone at any RPM I cruised through. The car feels faster. I'll see what I can do about getting a decent video posted. Edit: My attempt at recording exhaust audio. In the beginning of this video you can hear the whistle noise I mentioned. This is a video of the very first start-up after installation. My wife was apparently scared to rev the engine. The whistle sound can be heard around the 18 second mark. Here is the video of the sound with different speeds at cruising RPMs. A couple of drive-bys. The whistling can be heard as I pass the camera.