What about an old truck like my 69 Chevy Step-side that never had pollution control cr@p on it?
your truck is only bound by the emissions ratings that were in place for 69 so you could do pretty much what ever you want to your truck a system like that probably burns cleaner than your truck does now anyway.i know here in Wisconsin any emission controls must be left in place to be legal for the highway. that being said i know a lot of people that have removed smog pumps and catalytic converters of their old trucks and don't have any problems ,they just don't advertise it.
Reminds me of the truck I had in the early '80 before OBD.
Somehow the emissions junk would become disconnected (must have vibrated loose
) so they ran right but you couldn't tell by lookin' at them