Devil, it's no big deal. Someone has improved upon ATC's standard design. Even the ATC factory tweek their basic off the shelf products for special custom instals (*I know someone who has this on 100's with special ATC amps and subs etc). I'm sure someone could also tweek PMC for a benefit. Anything can be improved. Even an already tweeked ninja!

*This service is only offered to those in the trade, not for home users.