Wow, that is impressive. Another way I've seen to keep the valves and injectors clean on a direct injection engine is to suck a can of cleaner directly into the intake manifold. I did it on my 2.0 turbo 2009 VW Tiguan and it made a huge difference. They're also known for deposits on the valves and injectors from DI. That mod alone was worth about 19 butt dyno whp.
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