wats up guys, i just got a g35xs sedan and im looking to buy a carbon fiber diffuser and/or splitter. i would like to know which is the best to get. by best i mean, fitment is good and requires little to no modification to the piece or bumper.

im also looking to get an exhaust thats not super expensive but also sounds good.

also looking to get wheel spacers. 20mm in the front and 15mm in the rear ? im assuming hub centric ? i have the stock 18' rims.

links to pictures, videos, and product pages would be very helpful.

thanks !