Stock vs Extrudehone intake manifold

[Verocious]

I had a client with a bone stock 2006 WRX come in for a base line about a week ago. He told me he had something he wanted to try out, I said great. So he did his mod, not telling me what it was and we put the car back on the dyno a week later. As you can see from the graph, just the extrudehoned intake manifold was worth a peak whp of 16, and peak wheel torque of about 8. But aside from peak numbers, the area under the curve has increased dramatically. Power deltas across the rpm range have increased as much as 20whp and torque at certain points. I think it is safe to say that the ported intake manifold is worth a solid 5-10% increase in power.