But ask them about the torque characteristics of the package. Not one or the other.
In real life quicker turbo spool, more torque at lower revs can be more useful. Always a trade some where.
For the record even the Mountune unit does add a touch of turbo lag on the St, but is easy to drive around, as it's only noticeable in traffic. If I was planning lots of track days I'd got the Airtech unit..
Personally I found Mountunes upgrades to be a nice trade off from drivability and out right power on the rollers.
- Cablelad likes this