I've Been Volumized For The 6th Time In A Year. it Started Out When I Had To Send The First One Back Three Times Because It Had No Effect On Truck What So Ever. then Cris At Pdq Told Me They Had A Bad Batch. number Four Was Perfect,all The Power I Could Of Ask For. six Months Later My Truck Started Smoking [black] And Leaking Fuel From What I Hope Is A Relief Valve On The Fuel Rail. when This Happened The Truck [switch Is Off The Whole Time This Is Going On] Has Twice The Power It Has When It Is Running Normal. it Also Sounds Like A Twelve Valve. sent It Back Three More Times In Three Months. pdq Just Sent It Back To Me For The Seventh Time. i'll Keep You Posted. 2003 1 Ton Sw 2wd 5in Exaust Ho 6sp