If you have the bmw m235i you know how fantastic it is! But if I had one complaint it would be the car doesn't sound as fast as it goes. So I found ML Performances and looked into this rear box delete. It sounds amazing! It's a must have product! The quality of the pipe work and welding is unmatched, It fits well also. Depending on your preference the tips provided are fine for the price but the ends of the tips where not rolled and where clean cut.. meaning they where pretty sharp so amending this is important if you dont want to cut yourself when washing the car. Also be aware the sound is very cool but you may come across a little bit of drone.. its expected but two ways to fix this is by when at low speeds just easing off the throttle a little more than you would normally. And when in sport mode (the pops are like gun shots) it's best to remove the exhaust audio fuse as it causes drone. Ps its unlikely to pass an mot, best to know your mot garage well or keep the old silencer and swap it back over for test.