I have one cant say i tuned it myself however one workshopped loved it then the other didn't
They cost alot though, best looking ebc in my opinion. They look nice in a gauge.
Take up Paul on the offer of the blitz dual for 300. They are the best bang for buck. You wont have any tuners argue about these
I believe the best is the hks evc if you have the money, at the end of the day it all comes down to the solenoid. Dual is the only way.