I've got a 1991 740 Turbo and have remove the old exhaust system. I have installed a 2.5 inch side exit (just before passenger rear tire) with a flowmaster fx and am now making 12-14 psi. On hard accelerations around those numbers and sometimes earlier, the car will stop accelerating abruptly. I believe this to be boost cut but was not sure as it sometimes cuts at around 9psi. The car is bone stock other than the exhaust and was making the factory 7psi or whatever before. I was expecting a minor rise in boost pressure but nothing like this. Any help would be appreciated as I am pretty new to this stuff.
thanks
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