sandcruiser
....back in the saddle again....
I ran a stock carb, MAF 6-1 headers and no smog equip on an 84 fj60. Heavily loaded w/ 31s we usually got around 14-15mpg. I think that the key is tuning properly and taking it easy on the acceleration.
Having said that, I don't think I would do a header again unless the exhaust manifold were cracked... in which case it costs about the same to go headers vs. stock and you might get a little bit of top-end increase in power w/ the headers. Maybe. Certainly it makes for a nicer exhaust note.
*we did pull the cat when the headers went on. that might have helped with mileage, but probably didn't help much with emissions.
Having said that, I don't think I would do a header again unless the exhaust manifold were cracked... in which case it costs about the same to go headers vs. stock and you might get a little bit of top-end increase in power w/ the headers. Maybe. Certainly it makes for a nicer exhaust note.
*we did pull the cat when the headers went on. that might have helped with mileage, but probably didn't help much with emissions.