If you're just looking to get rid of the muffler/catalytic converter that came on the '08, fitting an 06/07 oem header with 06/07 slipon works perfectly. A helluvalot cheaper than a full sytem that may only give you an extra 2 HP. I have an 07 header on my '12 600.
Thank you! We are addressing with an issue with a '08 600 we just bought for my GF that the seller claimed he had repaired the exhaust leak, but did not. The owner before him at cut the cat off, and attached an Akra slip'on with a hose clamp. Unfortunately for us, the expander slits on the slip-on are allowing exhaust to escape because the remaining header pipe does not go into the slip'on far enough.