This topic was created so we wouldn't need to continue highjacking another thread.
I like the SIR from the point of view that it will greatly reduce the HP deficit for someone who chooses to run a stock, unopened engine.
With the SIR, front runners will still spend the same amount of their expendable dollars to have the highest HP they can afford, but they may be 10-15 HP more than me rather than 20-40.
Yes, that's a selfish view, but I don't have much sympathy for people who spend many tens of thousands of dollars for engine development for amatuer club racing.
I realize that the SIR would require extra mounting, but I can do that on the cheap in the scheme of things.
I admit that I do not know how much an SIR itself costs. Maybe SCCA will provide them for free at each races to discourage tampering. :-).
on edit: SIR might keep my 2005 engine more competitive for more years. I didn't build my car thinking I'd need to reengineer engine mounts every few years. An SIR would mean I'd be fewer seconds off the pace of the fastest spenders, I mean, drivers.