Welcome to the dark side. 2.5 inch black abs pipe works great, take out the innner fender, remove the airbox, drill a small pilot hole on the fender where you think the pipe should come out, and try to line things up when youre making the hole bigger. You'll need a couple 22.5degree and 45 degree angles, I used a grey electrical cover for my top, painted it all bedliner red, big mistake, leave it black, looks like crap from the front. be carefull drilling the hole through the fender, you dont want to mess it up.
there is more things you need to do like relocate breathed holes to the inside, ensure you have a tight fitting boot on the tranny and tcase shifter, holes in the floor and firewall plugged (trial and error) and take the carpet out