Yes, I searched for an hour and nothing was specific to my general question. so please, help a newb out. Stoked I found the site, you guys kick ass.

Subject: I just picked up a 95 540i with sport seats, 6 speed manual. It was super clean and everything works, no issues. She idles smooth as glass. There is a little rumble between 2000-3000 rpm, but is smooth under and over that. I'm suspecting a vaccum leak, prolly the PCV. no big deal. she has 149K miles on her and it's been a California car all its life. I'm 3rd owner. Clean Carfax.

A. what problems should look for? what seems to be problematic on this car?

B. What performance mods would you do? I'm thinking cat back exhaust, airbox and chip. I want a little more go, yet keep reliability in tact.

Appreciate any input. Ive had an old 87 535 for years. This is a whole new ballgame!