New 03 3.2 CL type S 6-speed - few questions

[junomean2]

Hey guys,

I am very excited to have my newly purchased CL.

First question: I want to replace the spark plugs, is there a specific brand or type that I should be looking at for best performance?

Second question: Mechanic who checked the car out said that he saw a minor leak underneath. He said it could be oil pan or the rear main engine seal, does anyone know of this being an issue with this type of car?

Finally: I want to do work on it but nothing too intense. I am thinking an intake and I can't really think of what else. Anyone have any good suggestions?

Thanks guys, looking forward to hear what comes.