I don't see much difference in the K04 over the IHI turbo when driving normally, apart from the boost comes in a little later and the Turbo is noisier over standard form but not in a bad way, mine is DSG tho so that might make a difference in drivability over a manual box,
The manual box might feel a little laggy low down ? But it's something you adjust to and soon get use to it,
When out on the open road it's a different story, as soon as the pedal hits the floor all hell breaks loose and it just pulls n pulls were as the IHI soon runs out of puff up in the rev range, it's not stupidly torque steering all over the place it's very composed if you drive it correctly and control the power with your right foot it's great ! Or if you want you can drive like a cock and wheelspin it in 3rd gear you can do,
Couple the K04 with the Powervalve BCS and on full chat the sound is incredible, it is by far the best exhaust that I've ever had on a car and I've had a few lol