I have an 04 4x4 quad cab hemi, I have k&n cold air, flowmaster, tbs and flashpaq tune 93. I'm lookin to possibly do headers, under drive and msd coil packs, possibly a zex blackout kit as well. Does anyone have any suggestions on these mods and what the biggest bag for my buck as far as gains are concerned, besides the n2o of course, it's my daily driver and I am looking for good gains!

 

get rid of your flowmaster, do the headers. Gears will help you out too, but are pricey. An efan would be about my only other suggestion, pretty cheap and good gains for the money (about 10 hp and 1-2 mpg)

 

What Efan would you recommend? I'm also not too worried about price, I just want the most gains for my $$ don't want to spend $500 for 2hp gain, lol

 

I also have the cat back American thunder kit, what other system would you recommend

 

4.56's but will be $$ due to being 4x4 unless you DIY. Save the $$ on the MSD then look into the Summit c2516 20% under drive.