Yep.
I think what will happen, from my info chatting with the racers.
The guys who have stock 525's will run them until there's no one left. So, a couple more years at most with the 525 SVL's. Then, unless some org screws it up again, the new SBI engine (SVLX), with the new lowered RPM, will be the norm.
However, I'm not sure a stock 525 won't keep up with the SBI engine with the lowered RPM. The 525 is allowed 5400 RPM. The SBI 510 engine is only allowed 5000 RPM.
Will be interesting to see at the Lake Race when they run both classes at the same time, (as of now)......