Im the best person to ask I had a 2006 S60R gt with a Bsr chip. Europsort exhaust and intake. It got stolen and decided to save money and get a Ms6. I will tell u this.. I spent alot of money on my Ms6. I had to get Cpe standback. Ets Tmic. Cpe downpipe , Cpe exhaust, Cpe cold air intake Hks Bov and spend $600 on a Tune to get my car as fast or close to my S60R that just had a chip and exhaust....
And believe it or not I still feel like the top end the R is faster even after all these mods..
At the end of the day for the money you can't go wrong with a ms6. The R is hawt rare but getting old.. the turnig radius is pure s*** also on that car but i Loved it and I still miss it .