2.5" tubing and very little backpressure. The tip is a 3" double-wall design with Flyin' Miata engraved on top. All stainless steel construction including the flanges with a lifetime warranty, like all our exhausts. For turbo use only. Fully compatible with all stock flanges, including stock catalytic converters as well as the FM one.
Warning! These will be extremely loud on naturally aspirated and supercharged cars. They're not "cool loud", they're "you will get stopped by the police loud". To try it out, remove your stock exhaust for a short drive. Turbo cars do not have this problem due to extra muffling provided by the turbo itself.
Lifetime warranty for the original owner.