Shark may be able to sort you out with a remap, though their car selector is down at the moment so you'll have to ring/email them.
Exhaust wise there is a Polestar upgrade that was developed with Volvo themselves.
http://www.swedishcaraccessories.co....ake-2253-p.asp
I usually use JT tuning or Ferrita but neither of those make anything for your model of car strangely.