Can go cheap or expensive, depends on how you much you want to spend. There's peddle commander at like $250-300 or Chinese 9-Drive which functions about the same way and reviews say it works great for $70. Can go with good intake like s&b for $300 or a low cost alternative for $50-60 on amazon and ebay that get good reviews and are spectra cold air clones or get a drop in filter like k&n. I normally don't see a improvement with fuel cleaners, but used bottle of gumount P. E. A multi system tune up in a tank and 1/2 way through tank, felt big difference so something was dirty with 40k on truck. Custom tune like others have said, catch can, no so much for performance but will keep cleaner engine, as they say. I went with a cheaper w1 can, good quality and like $40, just had to buy 1/2 inch hose and fittings.