I had it installed 3 weeks ago. I am VERY happy with it.
I had to change the downpipe in order to run Stage 2 (Evotech flash) but I did not want to go catless. I don't mind 10whp less , I just did not want to deal with smell and also did not want a very loud exhaust.
Catted downpipe was the only way to go for me and I am very happy I went with AR Design. I got what I expected.
I was planning to get the bmw performance exhaust but at the moment I am so happy with the current set up that I will keep it as is. I love the exhaust note at every RPM , half throttle or WOT - just the right tone I would love to hear. Cold start in the garage is simply amazing. It is actually very loud (for me) for the first 20 - 25 seconds but sounds great ! Golf Tee mod done by the way.
Regarding the smell, I did not notice any even sitting at traffic lights with the windows down. If I let the car idle for some time in the garage , enjoying the cold start :-) , then there is a bit of smell but still not much.
Even with the flash, there was still some turbo lag and the downpipe took care of it. Spool is MUCH quicker.
I was not there during the install, so I don't know how it went but the guys would have let me know if they had any trouble with the fitment. I believe it went very smooth
'11 E92 BSM 335i / Saddle Brown Dakota Leather / M Sport / 19" 225M / DCT / Navi Pro / BMW Individual High End Audio System / Cobb Stage 2+ / AR Design Catted DP / ETS FMIC & Charge Pipe / K&N Drop In / BMW Performance Suspension / BMW Performance Diffuser / M3 Lip Spoiler