The M2 CBE I have on my Base Model Z is outstanding for both sound and durability. The thickness of the metal is great because I dropped my Z 1.5inches, and take railroad crossings like a maniac. There is a hollow metal reservior between the mufflers (can't see it in the pic, sorry) and it completely eliminates obnoxious idle noise - I LOVE IT!!! Not sure about it's affects on my performance as I am a n00b
The Weapon R short ram intake with SPECTRE filters and couplers (so everything could be red) has given me a noticeable kick off the line, and push at higher RPMs at the top of both 2nd and 3rd gear.
Exhaust - $350.00
Intake - $325.00
Air Filters - $25.00 per