Is anyone using any tricks from the Focus ST on their Fusion? I have watched a few youtube videos about oil getting built up on the valves, and the recommended fix is a catch can. Usually that is done with performance applications. Anyone else running a tuner? Livernoise is a little expensive, but another customer that I have talked to claimed a gain in MPG by 11%...that is in addition to the gain in horsepower.
How about any larger turbo or different downpipe/high flow cats?