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post #6 of (permalink) Old 08-10-2019, 12:29 PM
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Originally Posted by jobaa View Post
I installed a K&N filter along with a 4" exhaust with straight through muffler, new bellowed up pipes and deleted the back pressure valve. Didn't change anything else. My fuel economy dropped by about 2 MPG. Anybody have any ideas? Did I do something I shouldn't have? It seems that these mods should improve economy and performance but neither is better. The only thing I've noticed is a different exhaust tone and I can hear the turbo whistling a bit more.
The exhaust should sound different, youíve removed the original set up..

Since youíve changed a few items, any single one may be the culprit. As mentioned above, I hope itís just data from only one fill up. You need a few fill ups/tanks of fuel before you want to compare data sets.

'00 F250 XLT 4x4 (born on 6/00), manual tranny & hubs, SPA Techniques EGT/Boost Gauge, Homemade Return Fuel Regulator, Toro Liner, 203* T-stat and Coolant Filter, LUK Clutch, flywheel & pressure plate, Amsoil Dual Bypass Filter
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