I have a 2004 Z71 1500 Avalanche without body cladding. Im looking for:

Long tube headers Preferably 1 5/8 primaries..with off road y-pipe...these little 5.3L dont need to big...something reasonable like hookers.

265/70/17 is the stock tire
I want to go about 1-2" dia bigger...and not much wider...still fit inside stock wheelwells. I like the Goodyear AT/S that came on it but I can only get 275/70/17...or about 1/2 in taller.
I would like to get wheels also...but to be honest I think the 3/4 ton chrome stock wheels are the best looking...you know with the holes. Does anyone make a 17x9 with 6-lug? I dont want to go too ghetto. It came 4.10:1 . Maybe a bigger wheel/tire?
Any suggestions?