Troy there are numerous cold air intakes that can be installed without a tune. Two off the top of my head are the BBK and Roush cold air intakes. However do not expect to much of a performance gain from the non-tuned system. Your real horsepower comes from the tune. There are quite a few threads around this subject on stangnet and other mustang sites. As far as having a shop install the tune instead of buying a tuner I would recommend not going that path. If you don't have the tuner you remove your ability to restore the factory tune. Which if you talk to other members they will tell you that having the factory tune is a lifesaver. Hence it saves you very costly repair bills. Save a little longer and get a cold air kit from a reputable tuner such as bamachips, brenspeed, or steeda all great. There are more that I am sure the other members will chime in on. As far as tires there are a lot of places you can go it really depends on what size tires you want and what brand. I personally found the best deal for my new tires on ebay. I paid $400 for BFG KDW's and $35 to my local shop to have them put on. I couldn't touch that anywhere else. I would however take a look at the stangnet sponsors for deals, tirerack.com, and discounttiredirect.com to name a few. The mods are expensive so take it a bit at a time. I personally have had my Mustang since February and I am just getting the chance to do more mods. Rest assured as you mod your car there is great info here. I have been coming to this site since 03 or 04. I was under a different screen name then but the guys here have helped me a lot.