Yeah the 5.9s aren't that fast honestly. My cousin (yes it's a different one so keep count) has a 1st gen RT with a transplant 5.9 and he's only pulling 14.3s out of it with a stall, M1 intake, headers, efans and a stage 4 raptor transmission ($2500) The 1st gens are considerably lighter than the ones the 5.9 came in stock. If I remember right the first gen extended cab is lighter than the 2nd gen regular cab. I'm not impressed to say the least considering his mods.