I mode is simply a different throttle map. No change except its more powerful.

Exhaust means tune although less likely to cause damage with cat back. be careful with full exhausts as many foul the steering knuckle causing vibrations via the steering wheel.

RE tune nothing really needed to make more reliable but I have a brand new OAS if you want one. $150 and it's yours and it's one that connects directly to the Oil intake. No special tools needed to open and close. A better BCS can help but is only truly useful if you make it's operation 3 port v 2 port which WILL mean a new tune as waste control solenoid maps needs to be reduced to approx 30%. A new TMIC will help with keeping things cool as new tune will mean more boost.

If you use E85 you will need a bigger fuel pump and bigger injectors.

Who put the Brembo's on?

I hope that's a manual.

Look at my or Scary's build threads for further info. All the best.

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[COLOR=Black]Liberty GT Spec B tuned 240 HP & 372 Nm at the hubs.[/COLOR] "Instead of banning high performance cars - ban low performance drivers"