I would tend to disagree with the last statement at least in light of my experiences. I have played with and continue to play with DODGE TURBO ENGINES. They are cheap, pretty fast all things considered and where else can you keep increasing the boost as long as you can add fuel without having a rod seperate or the top of a piston come off. I'm talking stock bottom ends and pistons holding up to long pulls at over 22 PSI.
Getting back to my point, I throw so much fuel at it that the injectors do get crappy after awhile. I use a product called SEA FOAM. Its cleans stuff almost back to squeaky clean. Its safe for O2 sensors and cats. Its reasonably priced too and works in carb powered vehicles also. Ihave seen at quite few stores like FLeet Farm, Tractor Supply and some of the chain auto parts stores.