I have an 86 420SE euro with 165,000 miles on it. Whenever it blows, I am going to put a new 300hp euro 560 motor in it, but for right now I just want to "optimize" my current engine, if you will, and get as much performance out of it without doing anything too crazy. This is what I am going to do to it, and I am inviting any opinions of whether what I am doing is good or not, or if there is anything I can do better or if there is something I missed that I can do to it. I am going to put a Flex-a-lite dual 12" 2500 CFM electric fan on it, a K&N filter, a Jacobs Ultra Team performance ignition (control box, coil, plug wires) and better plugs (I am hoping this will also smooth out the idle), and a completely new stainless 2" exhaust (dual pipes as it is now in euro form) from the manifolds back with a Random Technology High Flow cat, no center mufflers and a performance rear muffler on which I have not decided yet (help!). I was thinking about an AMG of a wrecked E55 or a Remus, but those are insanely priced. I am wanting something a little less expensive if possible. Also, I want the exhaust sound to be somewhat conservative, I don't want this to be a Camaro and I don't want to be able to hear it inside the car. Any suggestions on this or on anything else I have said? Thank you in advance for any help.