IMO, the best combination would be S2 (with or without Toys). Depends on if you are going to run race gas, meth injection, and/or go to the track. If you answer "no" to these then don't bother spending the extra money for toys. It will be a waste. Get a Forward Motion wga to replace the S2 wga. Holds boost much better and the part throttle boost is very very minimal.
You do not need anything else other than S2 to support S2. It is a complete bolt-on and go mod. It comes with everything you need. Wga, PCM, MAP sensor, TIP sensor, and injectors. Everything is easy to install. You can do it in your garage or driveway.
Now if you want to maximize the most out of S2, get a 3" TBE to include the 3" O2 housing and meth injection, and wideband since you will need to know where you are a/f wise. A larger intercooler wouldn't hurt either but it isn't necessary.
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