ive cleaned both, run a high flow filter and cold air intake,, and 5w 30 oil, thinest that is practical to run, drive it like a granny, and im not nesacerally after the money back id just like to make the lack of power more liveable and keep the same economy if not improve it, after all number to is crushed to allow number three to run on the standard manifold, and i was more after recomendations for brands, sorry for not clarifying