What he said. The best way to improve mileage that I have seen is to drop in a Diesel or a Ford 302. But that's probably not what your looking for.Old Scout said:I gained one MPG with catco cats. It's a heavy fulltime v8 powered 4wd truck, 14-16 is about all your going to get!
I would like to know more about this ? First time I hear about it ?Old Scout said:What year 4.0??? 96 up will trip the CEL with a cat efficiency code. Dump the dumbass K&N filter, it will kill your MAF sensor!