Did any one happen to notice when they got a gmpp manifold that only the 2 middle ports are the only ones that are honed out? If not thats how mine came? should it be like that? Im prob gonna hone out them my self.

 

if you gonna try to hone the gmpp you might as well sell it and hone the stock one .

 

just the 2 outside ports that 2 middle are honed.

 

yeh i did that to mine finished the two outer ports just went to home depot and got some grinding stones that go on a reg power drill you will need bit extenders there with the drill bits then just finished with a polish kit for a dremel

 

pretty sure its not supposed to be like that, i think all mine were honed

 

you notice good power difference from the gmpp manifold?

 

i guess it only gives u 4 horse and 6 foot lbs of torque.