I know I have another problem with vibration but ever since I put the new exhost on my truck the gas mileage sucks! I know Its a big truck and there usualy not the greatest but this realy sucks like 9 to 10 mpg no matter city or highway ya! nothig is modified no large tires nothing , the exhost fumes smell very rich, should I get new or is there a diferant type of o2 sn. to get to help it or somthig else?

 

what is your truck what engine dos it have what exhaust system did you put on it.

 

I have a 92' 351 v8 3.55 gears 4x4 and dual exhost not cats or air pump because the pump wasnt working and cloged up the cats, and the o2's are still on and the egr valve. This problem was preasant before the exhost change over as well!

Mark