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800 is quite alot for install, ive seen 150-300 for downpipes and 200-300 for front mount intercooler install. Intercoolers might be more because some arent just bolt ons and require cutting. try to ask a forum member if they can help you.
getting a larger intercooler is always a good idea. though there are plenty of cars running DP,tune,intake(stock IC) and run great!
and since your car is CPO, just watch out the intercooler and downpipes are easy to see/hear and they can void your CPO warranty if you have any engine problems.
The tune in my opinion i would highly suggest. because it is easy to take on and off for service. There shouldn't be issues after installation of the jb4. maybe extra wear on the engine and parts but nothing that will break or fail. if you run the wrong map you'll most likely get limp mode. change your plugs also!
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