It is far too expensive IMO.
If akropovic dont make one does that not tell you there is not much market for one.
Exhausts tend not to net any real gains on the CSL/M3.
Most want a lighter/better sounding exhaust, YES
But for me 4000 euro for a bit lighter and better noise, but no considerable gains is a no no.
For fucks sake most of the CSL owners on here, wont spend 1100 on a decent back box and wait yrs for a 2nd hand one to come on the market
, never mind nearly 4k.
For 4k I would want at least 40bhp from an exhaust, not 7-10bhp