Standard Focus RS with Sitech Racing Inlet manifold

So we have finally fitted a Sitech Racing cast inlet to a standard Focus RS.

The car was a completely standard 1500mile example.

The RS was put on our rolling road first of all, where it produced 288bhp slightly down on the book power. We then fitted the Sitech Racing inlet and re-tested. The end results showed a gain of 12bhp, but the power delivery was much improved with the gain in power from 4000rpm right upto the rev limit, with a far less pronounced power drop off at 4500rpm.