I too am seeking the same "tweeks" I have a '77 450sl and have dressed up the outside with 18" rims, added a sound system, made my own oak wood trim inside and now all that is left to do is beef up the engine a little. I don't want to pull the engine and get into major overhauls, but I do want to look into exhaust modifications and some intake options. I have a Holley air filter (just like K&N) and I recently purchased the Jacobs Omni Mag and am waiting for some wires that they left out. I will let you know what that does for the car.

KAD
'77 450sl