[olddog]

My guess is that opening up the engine will void what ever warranty it has. Based on some stories over the years, I'm not convinced the warranty is all that is suggest before the sale.

Going to a dual plane intake (assuming it has a single plane now) helps low rpm torque, but depending on the heads and cam you may end up with a combo that give the worst of all worlds.

A reduction in rocker arm ratio would calm a cam down.

I would talk to Roush. Tell them what you do not like. You might be able to tweak the timing curve to make it a little more civil.