On my '96 Patriot, I realized the supply hose was 5" and the intake plenum and the filter were set up for 7". There were reducers at both ends. I tossed the reducers and installed 7" hose. It made a 10 point difference on the restriction gauge. Heres hoping you have room and cash to do the same. Spartin uses a 7" hose and I got mine from a local Firetruck repair. Best of luck Phil