Just a general non tech question. As we know the challenger has factory shorties. So why are headers illegal? Esp if using catyletic converters?
I know good and well that! Grew up in Winston co Alabama near Cullman. Didnt have insurance til I joined the Air Force at Maxwell/Gunter in 1998!In Alabama it's wide open. No emissions testing. Very lenient on noise. You can do anything short of fabricating your own car. I actually see "home made" cars occasionally but they are off the road pretty quick.
Oh yes, driven through Addison many times. 78' was the year I graduated HS. My HS car was a 68' Thunderbird with a 429 CID Thunderjet 4V with straight pipes! Love good exhaust. My new Scat goes in Thursday to have Dynomax Race Bullets installed. Little nervous about it. But we'll see!
State laws on this subject are all over the map so to speak, but federal law prohibits the modification of any emissions related system on the vehicle. This includes the exhaust.Illegal where? In Oregon headers are legal although there are somewhat arbitrary noise ordinances involving exhaust systems. Most vehicles are required to pass emissions testing periodically but headers are not even looked at by DEQ.
Of course US States have a patchwork of laws and ordinances so what's legal in one state, city or township may not be legal elsewhere.