To mod or keep stock?
My 2 cents... since you already have a 507, I would suggest keeping it stock unless you are going after numbers or tracking the car regularly. For normal dd'ing, we already have way more hp/tq than what we would actually use (legally
).That said, a tune with ROW boxes/dry filters will be great. You will not see a huge jump in hp/tq but the tune does offer better throttle response and improved overall driveability. I have the EC tune and row boxes on my regular C63 and so far I'm loving it.
If your car does not have an LSD, invest in that.
If you plan on tracking regularly, invest on the upgraded cooling package. If only dd/occasional spirited weekend drives then not required.
If you're after more sound and power gains then LTH.
Good luck and drive safe!






