Just installed the dual tip Remus exhaust. This kit is also rebaged and sold as the AC Schnitzer kit as well. Everything seems to be made of pretty good quality stainless steel. It is not a true cat back exhaust, the installation requires cutting of the stock exhaust after the cat.
It is extremely similar to the single tip Remus exhaust that many Cooper owners have, like this one:
It has 2 mufflers, the bigger one on the right side connects to a smaller one on the left. The exhaust tips are 3 inches in diameter with the Remus logo on top.
I have a 2005 Cooper and the exhaust hanger seems to be the same as any other 2002+ Cooper as well, so fitment was perfect. However, I do have to take off the spare tire because of the extra exhaust tip. It took my installer about 1 hour to install the system. Most of the time was spent on cutting the bumper just right and adjusting the left side tip to the correct angle.
Stock exhaust on the car
Remus installed on the right side
Cutting the bumper for the left exhaust tip
Installed on the car
The stock exhaust sound from driver's seat, windows open
Remus dual exhaust sound from the driver's seat, windows open
Standing start and revving in 1st and 2nd gear, then cruising at 80km/h in 5th gear
Revving the engine in the garage
Remus idle from outside
Overall I'm very pleased with the system. It looks great, really enhances the look of the Cooper in my opinion. However it is a little bit silly to have 2 big exhaust pipes from a 1.6L engine The sound at idle is a nice deep burble, and I like the little popping sound when the engine revs down too. Surprisingly it is hardly any louder than stock. From 2000-4000rpm it does have a slightly lower tone and a bit louder than stock, and 4000+ it sounds pretty much just like stock. It has basically no sound at all on the highway, however it is a tad louder than stock cruising at 120km/h (75mph) due to the high rpm (3700rpm) the cooper revs at. The overall volume is within 10% of the stock exhaust system.
If you want a system that gives the cooper a unique look, and relatively quiet performance, this is a very good system. But if you're looking for something louder or something with performance gain as the #1 priority, I suggest something else. Butt dyno and my G-tech timer shows virtually no performance gain from the Remus exhaust.
Pros: Cheap ($299 USD Shipped on ebay for north americans), pretty good sounds, nice looking dual tips
Cons: Doesn't really sound as good as the JCW sound kit, can't keep spare tire