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From TheSaabSite: "The 3.0 fuel pressure regulator also aids in performance as well but has shown signs of running excessively rich in very busy stop and go driving. Keep in mind that the objective of the 2.8 and 3.0 fuel pressure regulator is to decrease the combustion chamber temperature by adding more fuel in an attempt to prevent detonation. Detonation is absolutely dangerous to a turbo engine."
I am just checking if that is the case. Here is the link
http://www.thesaabsite.com/900old/c900fuel16valve.htm#APC+BOX+PERFORMANCE+UPGRADE
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