I just saw a commercial for Flowmaster on Trucks! on SpikeTV and they said the muffler would improve gas milage. How much would an offroad pipe (remove Cat), flowmaster, and exhaust improve gas milage in a ford 5.0L?
well...I'm not exactly brand loyal...what I'm looking for is how can I pick up milage on my EFI 5.0 with 156K miles on it and stock headers, assuming I can remove the Cat here in Michigan..... and how much can I gain? with a 35 gallon tank, spending $200 on exhaust....picking up 3MPG I get my investment back in maybe 2 weeks!
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