The intake piping has definitely been modified and the blowoff valve is aftermarket. Seems that portion is done. Next, does the vehicle have an aftermarket exhaust? If not, downpipe and cat back will take out restriction, then doing a tune will be good for the stock turbo. Any increase in power would be best benefited from an aftermarket turbo. Its really up to you and your budget on what you want to do.
Any questions about the Balt, all answered here:
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