H2O2

[Eric_R_Kissell at whirlpool.com]

Jim Green used water injection in Stage 3 of his 10vt 90tq conversion.

http://www.motorgeek.com/phpBB2/profile.php?mode=viewprofile&u=4&sid=e6516225fe70b68b8a24dec748fd9763

http://www.mswanson.com/%7Ejgreen/conversion_home10v.html
http://www.mswanson.com/%7Ejgreen/conversion_home3.html

I am not sure whether he used water injection in later conversions. I think
he did a 20vt conversion.

You might wander over to the Motorgeek site and see what they can tell you
about water injection in Audis.

HTH,
Eric