I certainly don't consider a ~15 CFM gain with the minimal invasive/risky work involved, a failure. This effort went a long way towards helping me understand how much each modification can be worth and in what part of the cycle they tend to affect performance. I'm looking forward to the next, more involved steps, whether they continue in this thread or a new one. Everyone seems to agree that all the glory is in the short turn radius but I'm still pretty fuzzy on what that ramp should look like when you are done and where the biggest gain can come, with the lowest risk of making a sprinkler. I've got a set of stock ProMaxx 171s I want to improve and when I look at the SSR I think I see where I'd want to start, but I'm probably wrong.