Hi all,

What effect would replacing the stock exhaust manifold with headers (TRD) have on MPG? Right now I am getting about 22 (city) and 28 (hwy) and I don't really want to go any lower than that. Also, would the gains achieved through use of a header diminish if bolted on to the stock Cat and muffler?

Thanks.


'93 Pickup | 22R-E | 2WD| Yeah...it's my daily ride.