I just bought a used pewter 1999 2dr, 4WD Tahoe. It has nerf bars and custom rims. I believe it has the same shocks as the Z71 Package. It also has a towing package. I wanted some advice on adding some stuff. I go to Colorado about 2 or 3 times a year and do a considerable amount of off-roading in the mountains. I want to add some stuff to it to improve performance, etc. Advice on exhaust, air filters, tires, lift kits (small lift), brush guards, etc. would be appreciated. I want to keep the cost down if possible. Also, if I did one thing to improve horsepower and still keep a warranty, what should I do? Any info would be great. Thanks a lot.