To warm up the intake for emissions, yes (only between the center two cylinders). But it doesn't balance the exhaust pulses between both banks for improved scavaging if that is what you are implying.
it has always been my understanding that only the ford engines required a H-pipe.gm engines balanced the flow at the intake.but what do i know?the only time it was ever recommended in a gm motor was in conjunction with a cheap aftermarket manifold
Mopars used them from the factory too. In addition to balancing the pulses, it increases collector length.
I would love to hear the theory on how the intake flow balances the exhaust flow on a Pontiac. Please enlighten us.
