has anyone turbocharged a slant6?

As for me Ide be looking for the crankshaft coming out the bottom of the engine. Its only a four main engine

Yes, they have turbo charged slant sixes as well as using nitrous. The slant six was originally developed as a performance engine. There are some great engine building tips here: http://www.allpar.com/racing/slant-six.html There is a really informative slant six forum here: http://www.slantsix.org/forum/viewforum.php?f=2&sid=316...e1988ab4b10a09c58b2c
They have gotten them down in the elevens and pulling wheelies.