My 1980 K20 is now sporting a 496 cubic inch stroker that runs 14:1 compression and dyno'd just shy of 700HP with the head and carb restrictions we have to run (hoping to get over that this year). Basically the truck just runs in truck pulls and the occasional car show, but at $750 for a drum of fuel I don't "joy ride" with it. I still want to keep it registered and inspected for the occasional trip to the local car show and if something were to happen to it (for insurance), but the exhaust is LOUD. 2" primary fenderwell headers to 3.5" collectors, 4" straight through "mufflers" and 4" pipes combined with the high compression makes for awesome sounding but LOUD exhaust. The truck is 100% operational and safe. Stainless lines and new brakes front and rear, lights, horn, parking brake, etc all work. With all the safety stuff for truck pulling it's safer than 95% of the vehicles on the road. I was wondering if antique vehicles (it's over 30 years old) are exempt from exhaust noise as I was thinking of registering it as antique, or if I'm screwed. Any help is appreciated.