I added it to my 92 audi v8 really helped how do I add it to a 1998 volvo xc70 engine? I added through the intake on the audi. Where is it in the volvo?

 

i was also thinking about doing this to my 850

 

One way I did it on the 850 we have is to look under the throttle cable cover (actually remove the cover) and you will see a vaccuum tree with several hoses connected to it. You can find the one that goes to the manifold and disconnect it, then submerge the open end of the hose in the can of sea foam, start the car, and let it suck up the liquid from the can. It worked well for me on the 850, and I would assume that it would work similar for the XC-70. Of course as always, try this at your own risk.

Glenn