Im new to the blower world and was curious why an '04-'06 blower wouldnt fit on an '03 pickup with 5.4L. What would it take to fit one on an '03? I was looking online and saw this http://store.roushperformance.com/detail.aspx?ID=554 and thats what brought this question to mind. If anyone could help clear this up for me it will be greatly appreciated. Thank you. - Jake

 

03-down is a 2 valve motor
04-up is a 3 valve motor

For your engine, do a lightning swap.

 

x2