Originally Posted by shawnzy
I am curious fuel mileage possibilities, and if k&n filters help that or are just a waste of money?? I am not very heavy on the pedal at all and 90% of my driving is county roads..
While waiting for my truck to arrive, I've been thinking about mods and obviously the first one you think about is a CAI.
From the perusal I did of a couple of threads, it doesn't seem CAI makes any meaningful difference. Or at least there's a lot of debate around that. People talk about 10 to 15 HP? That's not even 5% of the HEMI base HP. A dyno may see that, but your butt most likely won't feel it. Your ears will though: CAI do make a nice sound.
I think the big weakness in most of these aftermarket CAI is that the airbox is so flimsy compared to the OEM that it may well be possible you are actually sucking in warmer
air than with the OEM airbox. Perhaps best is simply replacing the OEM air filter with a less restrictive one.
CAI have been around for a while, and there used to be a time 20 or 30 years ago that OEM air intakes were so cheap and badly designed that an aftermarket CAI would make a big difference. These days, most vehicles have decent air intakes so the gain is less spectacular. And it seems the air intake of the HEMI engines is already quite good. And in the final analysis, all this really pays off if you tune the engine, and HEMIs seem to be already optimized and more difficult to tune.
So anyway, I'm thinking that I'll first put my money on a good cat-back exhaust system (not for performance, but rather to enhance the fantastic rumble of the HEMI).