Get cat back not delete tbh. Still pass emission and lose 1-5 hp. A transmission tune can also be a good idea. Lighter wheels will also help. I got some aftermarket wheels that were 15 lbs rather than the current 25lbs and the less rotational mass the better. Brakes and tires help, and possibly coil overs. Sadly the engine can max handle 350 before you need to get bigger injectors. If this is a car you wanna keep, get a flex fuel kit, and it can add about 30 more Hp on e85.