well again the one i got is the wrong 1 it does has the fender sheild but it doesnt fit b/c of where the rad hose is and its for the V8.. and i dont see to much difference between kits the only difference would be filter that has the restriction and the fender sheilds and the intake pipe not much difference except for the price but i know it has gained hp and a bit better hwy economy even w/o the heat sheild!! so as for the others i would have to trust the internet and well i dont!! but im also curious about premium fuel who uses what kind gas for their S/C'd engine??