Ready for Mods
 

Hey,
I just picked up an '08 535 xi which i believe has the N54 engine. I am looking for mod recommendations that won't break the bank. I'm thinking of the JB+ from burger motorsports and replacing the air filter. Not sure if putting in a drop in performance filter or a new come system is the right way to go for the money. I am also thinking of exhaust mods. I've seen some info on throttle body spacers. Not sure about that.

Please comment
Thanks