They have the kits on their site and it looks like they've got the sign off to release performance info. Also there's good news for everyone, the Mountune Performance RS MP350 kit will not affect your manufacturer vehicle warranty. You get all the performance gains without worrying about future warranty work.
MP 350 Kit
• High-performance, larger capacity alloy intercooler
• Mountune-designed high-flow airbox
• High-flow exhaust downpipe
• Mountune uprated fuel delivery module
• Revised engine calibration
• Mountune Performance badge
The Gains:
0-60mph in 5.4 seconds
0-100mph in 12.2 seconds
top speed of 165mph
MR 375 Kit
• Larger EC-approved 3" downpipe
• Anti-loosen bolts
• 200-cell EC sports catalyst
• EC EURO or UK-spec 3" cat-back exhaust
• Cast inlet plenum
• Mountune re-circulating bypass valve
• Revised engine calibration
• Mountune Racing badge
The Gains:
Power increased to 375PS at 6700rpm
Torque increased from 550Nm at 3,500rpm
MP 350 Kit
• High-performance, larger capacity alloy intercooler
• Mountune-designed high-flow airbox
• High-flow exhaust downpipe
• Mountune uprated fuel delivery module
• Revised engine calibration
• Mountune Performance badge
The Gains:
0-60mph in 5.4 seconds
0-100mph in 12.2 seconds
top speed of 165mph
MR 375 Kit
• Larger EC-approved 3" downpipe
• Anti-loosen bolts
• 200-cell EC sports catalyst
• EC EURO or UK-spec 3" cat-back exhaust
• Cast inlet plenum
• Mountune re-circulating bypass valve
• Revised engine calibration
• Mountune Racing badge
The Gains:
Power increased to 375PS at 6700rpm
Torque increased from 550Nm at 3,500rpm