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Improvements from NA bolt ons will be small. Some reasons boost cars respond so well to tuning is the possibility to increase boost pressure and the fact they tend to run very rich from the factory.
I would be surprised if intake headders exhaust yield more than 15-20hp. Some cams might help a little. I think 220 whp is about the max without serious investment and compromising the daily drivability of the car.
The boosted applications are going to be nice though.
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