i was wondering is a cold air intake going to make a big difference on 5th gen ludes ? i mean its not boosted or anything only thing i got that is modified is full catback hks and dc headers.

 

it will with your mods you got all that back pressure and now you need to let it breath get a intake with a k and n filter

 

yeah. put an ebay cold air (20$) and an expensive 4" inlet canister K$N filter (80$). put a 3"-4" adapter. rip out your stock airbox/ diaphram/boot. stuff in cold air with k&N filter and away ya go. oh and maybe move battery as far inside as possible to make room for K&N canister filter (4" inlet)

with your exhaust setup your car will get huge gains for 100$ 5-10 hp i would say at various points of powerband