I have a 1998 1/2 ton ex-cab short bed Silverado. It has a 350 Vortec engine and I have a couple of questions. First has anybody put a K&N air filter on this engine, how did it do? How about a new exhaust maybe dual exhaust or just a new muffler and pipe? What are the benefits, brand did you use, sound quality? How about any other tips to make my truck run better or have more power? How about tire size, how big can you put on a stock truck? Any info about any of these topics would be very helpful. Thanks!!