Apr 30, 2004 #1 E Ed Valvo Member Joined May 25, 2001 Messages 856 Since a TB is just a valve to let air in, are there rules against aftermarket TB's?
Apr 30, 2004 #2 G gofstbuick Administrator Staff member Joined Jul 20, 2001 Messages 2,205 Technically, anything in front of the cat requires an CARB E.O#.