no cats here, and no testing in my area. but to tell you the truth im thinking of putting in a pair of hi-flo cats to get rid of the exhaust smell. these days cats are actually getting pretty good. now on a vehicle i raced regularly i wouldnt bother with the expense. but the kiddo's nose when im loading him up in the truck with it running tells another story.
2005 crew cab, new crate lq9 with comp 212/218, 558/563 on 115 cam, 80mm t.b. coated long tubes, off road y, flowmaster cat back, dynomax bullet, ngk plugs, msd wires, k&n cold air kit, 4.10 gears, auburn pro lsd, transgo shift kit, nelson drive tune, trailblazer i-6 torque convertor, anzo lamps, ss front bumper, z71 tahoe rear bumper, debadged, kenwood touchscreen with headrest monitors, JL components, coaxials, sub, 5ch amp. bell tech 2/4 drop. 22x10 ss wheels with 285/35/22 bfgs.