whats the best but still cheap exhaust system for a ‘79 GMC jimmy
I would suggest that you take it a muffler shop and have a new exhaust put on. New duals with 2 inch pipe and a pair of good mufflers or glass-packs. I would use the glass-packs It will be much cheaper than than those male order kits and the outcome will be better.
when they are low . I have sensors my cars have yellow lights so pump them