I'm in the market for a turbo upgrade, but don't want to break the bank. I will be going with a 4" exhaust, piers taper cut delivery valves and probably 75hp or 90hp injectors. I already have a 3000 gsk and a # 10 plate. I was looking at Phat Shaft, BD, and Piers. Maybe someone out there has some experience with these or others. I can spend about $1,500. I use the truck for daily driving and occasionally race against duramax's and powerstrokes. Never tow. Turbo lag would be a big issue.