Welcome
springs - TRD, TEIN, Eibach. These are all pretty much the same, with about 1.4" drop.
struts - Tokico, KYB. only 2 I'm familar with. Most here like Tokico.
coilovers - JIC or TEIN, more hardcore spring and strut system with adjustable damper and height. I've got the JIC's and they're sweet.
rear sway bar - TRD, Whiteline (from Australia). Keeps the car from 'rolling' around corners >2nd best mod to me.
front sway bar - Whiteline. Most here I think don't have it, but I do. I can't tell a difference because I put both sway bars at the same time.
supercharger -

Hard to find now though. I just love mine, this is my favorite mod of course

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air intakes - INJEN short ram intake, TRD drop-in. Both have their + and -. If you're lucky you may be able to find the cold air extension from UPFD for the INJEN short-ram, so the cone sits behind the driver side fog light. I think the INJEN w/extension is the best. Just DO NOT get the intakes from E-bay!!! People have had problems with them.
exhaust - pretty open here. If you want to spend the money, TRD has a nice muffler. If you go all out, JP Performance make a complete system from headers back or you can buy it individually.
body kits - TRD lip kit is the best overall. But, they are getting hard to find. If you don't mind less quality, there is a fiberglass replica kit of the TRD lip kit. I've got the black widow kit and the fiberglass is very fragile and hard to keep up. There is also the octane kit, which is fiberglass. These fiberglass kits are cheap, but will cost you to put it on.
I think that this should get you started. There are more parts, but I think this is probably all you'll need. If there's anything else, just ask.

I hope your son appreciates what you're doing for him.
