does any one know of any upgrades you can do to the gsr manifold, I heard of removing the flaps on the inside, but I don't know how good it is, and also I just read that with the skunk 2 manifold you lose hp.

 

My old one was ported, and i enjoyed it.

 

ported or extrude honed helps

 

Just get the skunk2, and an ecu upgrade, you wont be sorry, trust me thats what I did. It would also help if you got cams too, let the motor breath!!!!!

 

i intend to keep my stock intake mani, i just don't want to do anything that will lose precious low end. ITR cams are the way i'm going to go, then i'll call it a day.

d