I have both, the Eurocharged tune and the SB.....and let me tell u what a difference the SB makes on the car! First I got the tune, made the car feel a little faster....but once I installed the SB....Holy Cow does it make it more sensitive and more responsive! Woke my N/A right up! I meant I know the SB doesn't give any horsepower but it sure does feel like it.