Hey cliff. I'd start off with an intake and an exhaust. I drive a Powerstroke and I'm on here mainly because i'm a diesel fan. I'm not necessarily partial to just one engine and knocking on everyone else's like a lot guys do. Anyway, I like AFE intakes and Magnaflow exhaust kits. It seems that AFE has the best out there. I like magnaflow because they're not as god awful expensive as some of the other kits out there. But just about any 4" mandrel bent turbo back kit is going to flow the same as the rest of them, so it's price and preference for me. And some guys think that a 5 inch system is better...unless you have a 5 inch turbo outlet, it doesn't. going anything much larger than the turbo outlet is 100% cosmetic and oftentimes difficult to fit. anyway I'd suggest freeing up the path in and out of your engine first. Just with exhaust and intake alone you will see a noticeable increase in power and torque. After that get the chip, and then you'll turn some heads. Also, check out a diesel show that you can road trip to. You can get really great deals on aftermarket parts that aren't normally available to you. Hope this helps..