on the head the exhaust ports(3) are all molded into one opening that goes into a downpipe. The thing that might help this car is if someone could design a downpipe without the catalysts and have them then go into one large hi flow catalytic converter, that is where I see the biggest power gains coming from in the 7th gen v6. Also the cat back has like 3 silencers and pretty restrictive mufflers so changing these would also help get some power.