ESi? Is it turbo? If so, it's a TSI if its an Eagle Talon. You don't need a turbo timer, you could either drive normal under boost when you getting close to your destination and turn off the car, or you can get to your destination let the car run for 30sec to 1min then shut it off. Works just like a turbo timer. You can raise the boost to 14-15psi on the stock system, pass that you will be hitting fuel cut till you upgrade your fuel system (fuel pump... I would suggest a Walbro 190 but it depends on your goals). Before buying aftermarket parts I would go over the car and do any key maintenance it will need. Maintenance is the key with these cars. People make the mistake of immediately start modding them. You don't need to go 2.3 stroker or any of that to increase hp. Simple mods can get you some decent goals. Set a horsepower goal first then you can get the help you need to achieve it. Set the goal now if not you'll be wasting money buying parts then having to sell them for others.

Good luck and congrats on the purchase. BTW, you don't need a Greddy boost controller... you can get almost any other well known brand. You need to decide if you want a MBC (Manual Boost Controller) or EBC (Electronic Boost Controller).

More info... you can find it at VFAQ Site - Visual Frequently Answered Questions and Talon, Laser, Eclipse 1G Info DSM