GM OEM Air Cleaner Intake-Filter Flow Restriction Indicator 15029058
I put one on a my 2006 dodge ram
basically 1/2" port.
BIN 104B1B
GMC C6500
1998, 1999, 2000, 2001, 2002
GMC C7500
1998, 1999, 2000, 2001, 2002
GMC School Bus
1999, 2000, 2001, 2002