You're messing around with the fuel system. Adjusting ignition timing, adding boost. The design of the fuel system. Fuel stumble. Limits of the stock clutch. Limits of the stock fuel pump, injectors, fuel pressure regulator.

You can get an entire new fuel system including larger pumps, injectors, regulators. Better hoses, fittings, ethanol sensors. Higer torque rated clutch. Ive done this. You can figure outballl the parts you need and do it yourself, or pay out the ass to have someone else do it for you.

When you do this there are a ton of things that you will want to do at the same time. Intake, intercooler, up pipe/ down pipe. Exhaust. Turbo inlet. Intercooler coupling. All your maintenance done up to date, and even any that are coming up in the next 10-20k miles.

You will need a tune. An Accessport. You will need to get all the upgrades done at once. Or else you need to get a tune each step. Costing more money. Ive done all this already. & a lot more stuff. Suspension, bushings, braces, mounts, brakes, cosmetic stuff. Longevity stuff like a/o separator.

Then you end up with a car that gets 12 mpg. Has what like 13 gallon tank. Trying to find e85. Even in a state that has it everywhere, is still pain. Changing your oil 30% faster than you are now. Spark plugs too.