
Look at these OTS (off the shelf) pump gas results for a MKVII GTI. Let's start with the baseline:

Now the OTS tune on 91 octane:

You will notice peak horsepower doesn't increase a huge amount but look at that torque gain of 45 lb-ft at the wheels. On a Mustang dyno, that huge.
The numbers improve further on 93 octane pump gas:

That's 31 whp over stock and 65 lb-ft of torque over stock.
A custom protune will get even more but very nice gains here especially down low in the rev range.

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