curious if anyone is running nitrous on the 4.2 motor. I have a low mile 05 s4. I have ran no2 alot on other cars just wondered what was the weakest link and how much the motor can handle. sorry havent done much research on this block as far as pistons cracnk ect.. any heads up would be great befor i blow her up. think I might start with a small 50 shot work my way up

 

i know of a very, very good company in the uk called "the wizards of nos" who are the best nos company in the uk if not the world!
contact them on either
http://www.noswizard.com
00441302 834343 dont forget time difference
or sales@noswizard.com
im absolutely sure they can help you out in some way or another
they have helped me on numerous of occasions even when i didnt buy their stuff
for example they told me that you cant nox a m3 1996, i didnt listen and done a 75hp wet shot from nx express which told me its ok on it and killed the motor within a month! (but did it go like a bullit!) they are unbiased and tell the truth