I have to tell you I've read all those threads about the Flowmasters and was hesitant to put them on, but once I did the switch from the old Dynomax Super Turbos to the Flow master 40s the car ran about 2 more pounds of boost.The guy that does the work on my car was the motor guy for Fred Vetter when he owned dynotech years back he himself has a 780 horse Turbo T and the car runs the same times with an open dump or through 2 3 chambered flowmasters.