Yeah what he said.
Get a 3.4" Pulley, as that is the perfect pulley for your mods. If you are going to do future modding, either you can buy your own pulley puller ($130) or you can rent one for the original pulley install ($30) and then buy a modular pulley system so you can change pullies by removing a few bolts at any time. With rockers and headers and the other mods you have you should be able to run a 3.25 or 3.2" pulley. I will tell you what I have told other members. It is my true opinion that a modular pulley system would be the best bet for you. (keep in mind that I am not trying to sell anything, and I make no money off of anything that you do buy so it does me no good to tell you this other than for me to know that you have knowledge about available products) You have mods already, and want to do a pulley. So a 3.4 is the perfect size, but you want to do other mods later that will allow you to change the pulley to a smaller one. Well, if you get a ZZP Modular Pulley System (available at www.zzperformance.com
), you can buy any pulley size you want from 3.4" to 2.6" in .1 inch increments, and a 2.45 and 2.35 pulley are also available. Well, since they have so many pullies you can buy the system for $139 (the hub & 1 pulley) with a 3.4 pulley. Then lets say you do rockers. Well that isn't enough to let you run a 3.2 pulley, but you will probably be able to run a 3.3" pulley, so you can buy a 3.3 inch pulley and put it on when you do your rockers. Then lets say you have that for a few months and decide to put on headers. Then you can buy a 3.2" pulley and put that on when you do your headers (because you should be able to run that pulley with headers and rockers). Well, that is perfect for the street. But now you decide you want to see what your car can do at the track, so you get your car ready to run at the track, and fill it up with race gas. Well, race gas isn't going to do you any good without a smaller pulley, so you could probably go to a 3.1 or 3.0" pulley at the track on race gas. And maybe you decided to go to the track before you got your rockers or headers when you are running the 3.4 pulley. Well, with race gas you can probably run a 3.3 or 3.2 pulley at the track, so you can just switch to the 3.3 or 3.2 easily without having to pull the pulley off and press a new one on. It just makes it much easier for future modding. With a press-on pulley you don't have all the size choices, and you can't change the pullies whenever you want in 3 minutes. I used to think it was stupid to get a modular pulley system unless you were going to do heavy modding, but not anymore, a modular pulley system works great for everyone if it has enough sizes (like the ZZP does) because you can basically get as much power out of your car as possible.
Oh, and about the T-stat. I don't know much about Arizona other than it gets really hot in the summer. How cold does it get there in the winter??? I am assuming the coldest temps you see is probably 30 degrees? If you don't get very cold winters and your summers are hot, I definately recommend getting a drilled 160 degree thermostat. It will keep your car cooler in the summer, making more power, and giving better reliability, and it won't run too cold in the winter because your winter isn't very cold. We run a drilled 160 degree t-stat in the GTP because it is stored winters. We drive it when it is 40 or warmer usually, so the cold t-stat isn't a problem.
Anyways, I hope you enjoy that information.