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Are you operating under any kind of budget? If so, then I'd spend the money on the essentials first: brake pads, brake fluid, brake ducts (because your brakes are the absolute last thing you want failing on your car at a track event), Whiteline transmission bushing insert (the Blowfish Racing bracket looks like a real cure for the problem but the bushing insert is an order of magnitude less expensive and may prove sufficient -- it has for a number of people -- and it's available now), and maybe a rear differential overflow catch can to keep gear oil from spilling onto the track (even if that doesn't ruin your day, it could easily ruin someone else's). I'd wait before doing anything else because anything beyond that is going to depend on the shortcomings you find, and that requires seat time.
You can go crazy spending money on upgrades to the car, but what you have is already phenomenal, as anyone who has been to the Boss Track Attack will tell you.
If autocross is going to be your primary use, then power is not going to be your limiting factor. Even on the track, these cars put down a lot of power, enough that it'll take some getting used to if you haven't tracked anything with this amount of power before, and yours already exceeds what these cars put out stock.
The reason I didn't mention any cooling modifications in the above is that these cars have thermal protection built into the computer, and you certainly won't be overheating the engine in an autocross. If you find yourself going into limp mode at the track, then it's time to look at cooling mods (from other threads on this forum, it appears that an air-to-oil cooler is the most effective modification in that respect), but otherwise, just change your oil very regularly and stick with 5W50.
You can go crazy spending money on upgrades to the car, but what you have is already phenomenal, as anyone who has been to the Boss Track Attack will tell you.
If autocross is going to be your primary use, then power is not going to be your limiting factor. Even on the track, these cars put down a lot of power, enough that it'll take some getting used to if you haven't tracked anything with this amount of power before, and yours already exceeds what these cars put out stock.
The reason I didn't mention any cooling modifications in the above is that these cars have thermal protection built into the computer, and you certainly won't be overheating the engine in an autocross. If you find yourself going into limp mode at the track, then it's time to look at cooling mods (from other threads on this forum, it appears that an air-to-oil cooler is the most effective modification in that respect), but otherwise, just change your oil very regularly and stick with 5W50.