hi have just got my 300zxtt manual its a 1990 a box of bits came with car in the box was two kn filters two turbo xs blow off vavles with fitting kit and some pipes and hard and rubber my question is are blow off valves the same as dumps and where do they fit are they as good as dumps or should i get dumps instead????????

I think blow off valves are the same, basicaly they both just release waste gas.

http://www.twinturbo.net/ttnetfaq/FAQpages/bov.html

 

blow-off valves are the same as dump valves and neither are as good as OEM recircs for performance (unless you are 5-600hp)

Turbo XS one are usually really loud dump valves

thanks guys hope to see some of you at a meet very soon