This customer's 2002 C5 with A4, engine is a 383 with 7 PSI ATI supercharger.
The data on the left shows how the engine functioned back in 2004 and then on the right after using our w/meth injection and custom tune.

Refer to before/after values at bottom

As we know when using supercharger in most cases as seen with the BEFORE that even with larger fuel injectors the engine ran 11 % too lean.

Also a norm is due to Boost the intake are temps are high as seen below when boost was on IAT went from 80 to 140 degrees, being too lean the end result is lots of ping.

As seen after the w/meth was installed and our custom tuning you see even when putting out 650 HP at high engine load all the ping is gone