We have an order of these coming in shortly so thought we would offer a group buy     The plenum spacer adds more midrage power and torque to the DE and Rev-Up engine, we typically see between 5-15hp difference depending on the car     You will receive:   1x Horsham Developments 8mm Plenum Spacer and gasket Fitting kit - including strut bar spacers so everything will still fit after installation Detailed illustrated fitting guide   The plenum spacer adds more midrage power and torqu