Has anyone installed the Bullydog or any type of propane injection to their 7.3?? just wondering b/c i heard it gives alot more power while using very little propane. and how much does it cost, i remember seeing on the tv show TRUCKS they put the Bullydog system in the duramax and got dramatic power gains, and its only around 700 bucks i heard. the only thing is that the tank and all that weighs alot and where would you mount it if you dont want to put it in the bed???could you put it underneath??