S sd001c4877 New Member May 1, 2007 #1 performance straight through watever i was told i cant do away with centre box as this is needed for back pressure on engine any info much appreciated
performance straight through watever i was told i cant do away with centre box as this is needed for back pressure on engine any info much appreciated
S stig New Member May 1, 2007 #2 Petrol engines do require a front box to create back pressure, without it torque comes down but revving more freely and uses more fuel. Did your rangie go or not?
Petrol engines do require a front box to create back pressure, without it torque comes down but revving more freely and uses more fuel. Did your rangie go or not?
