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RR Fuel Reg Upgrades?

Kevin asked back on July 14th if anyone had any ideas on why 
he might be suffering performance fade above 4200 rpm
under load.  Charles Probst in his Bosch Fuel Injection Book
talks about the need to increase system fuel pressure under
high boost conditions to prevent leaning out.  You want it
rich under full boost to prevent pre-detonation.  His suggestion
is the Microdynamics Rising Rate Fuel Regulator. The smallest gives
0.5 psi in the lines for every psi in the maniforld, I believe.
Does anyone have any experience with these units? 

Paul Timmerman