Ok, I'm considering the following mods. Reasons in brackets.
-Pipercross replacement panel filter (add a little to the nice straight 6 engine note. I read induction kits etc are a waste).
-Replacement exhaust (quite simply, I want quad tailpipes like the M3).
-ECU remap (better throttle reponse).
1) Are there recommended remaps out there that give best improvements?
2) What exhaust would you recommend? I considered the Remus PowerSound Quad Tip shown here on an E90 http://www.e90post.com/forums/showthread.php?t=112588 Importantly, I don't want a cheap boy racer type exhaust note though. A little extra base would be welcome however but nothing that makes the car sound less individual at WOT. I think 330's and M3s sound very individual almost 911 like!