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Search around for more information, but the first thing you should do is make sure all your maintenance is up to date. Spark plugs, ignition coils, serpentine belt tensioner, etc are important, easy things you can do. After that common, expensive issues at that mileage include walnut blasting the intake valves, oil filter housing gasket, oil pan gasket, valve cover gasket, turbo seals and wastegate wear, among others. Your high pressure fuel pump fuel injectors, and water pump are also common trouble areas. The OFHG and OPG can be done very cheaply if you do the work yourself. Otherwise shops will charge you big money to do them.
Once you determine the health of your car as it sits and correct issues you should look into an aftermarket charge pipe, a bigger intercooler, an oil cooler if you don't have one, and catless downpipes. To run e85 you need to upgrade your low pressure fuel pump. Several vendors carry all this stuff. There are a million threads on here arguing which brands are best, so search for those.
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