Join Date: Sep 2006
Location: Las Vegas, Nevada
Both sides of the IMRC are available everywhere from rockauto, mmr, napa, carquest, oreillys, advanced auto, autozone listed under intake manifold gaskets and intake plenum gaskets, however if you are looking to replace the gasket from the upper intake manifold (y branch with throttle body) to the lower intake manifold, you will need to trace and cut your own from gasket material since it has been obsolete for a while now. Or you could use right stuff rtv, but you'll likely never get it back apart again as that stuff is tenacious.
-1996 Pearl White Thunderbird 4.6 Sport 4v with many mods:
Current Best: 13.583 @ 103.74 10/2014.
227hp/241tq measured on calibrated mustang dyno, tested at full vehicle simulation with inertia enabled, no number skewing.
-2001 White Ford F-250 Super Duty 6.8 V10, 4-door, 4x4, Limo Tint, BFG KO2's, Bilstein 7100 Remote Reservoir Race Bypass Shocks, 6" Spring lift, Kenwood Double Din, K&N Intake, FlowMaster Exhaust
Amber_Murder's Daily Driver.
-2005 White GMC Sierra 3500 6.6 Duramax, Dually, 4-door, 4x4, Limo Tint, BFG Commercial T/A's, Rancho RS9000XL Shocks, Kenwood Double Din, K&N Intake, Banks Monster Exhaust
Chris_Murder's Daily Driver.