Maybe - but it would have made more sense if the Stage 2 was bundled with (and optimized for) additional hardware (catback exhaust, intake, intercooler) that could get even bigger gains. Instead it feels a bit nickel and dime to charge $500 for what Stage 1 should have been from the start.
I totally agree on the shock mounts, but why think of that AFTER you've released the product?
I think I've posted this before, but when I spend that much money on a product from a company with their reputation I expect it to be their best effort with use of the facilities and engineering team they talk about in the marketing. From what I'm seeing, it doesn't appear we're getting that.