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Ummm, I'm pretty sure they are Mitsubishi TD-07's. They literally max out 11lbs boost at 6k rpm. Raising boost From 8.5lbs @6k to 10lbs added 40whp adjusting for timing and a/f ratio all other things equal. It will be interesting to see what would happen with one size larger twins that could push a mild 15-18lbs at 6k, 475-500whp? Remember, this engine has direct injection and the b4 s4 doesn't.
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