[Transfer]

Background: I've been mashing on my S58 with regular redline drives for a year now.

Boost threshold and tuning for linear power is not turbo lag. The S58 has almost no turbo lag when on boil >3.5k rpms. It does have a boost threshold though, not really starting to develop power until about 2500 rpms and by the time you hit 3k torque is strong with Hp rising linearly until about 6500 RPMs then strong to 7.2k. It feels more naturally aspirated than S55 with a smooth and powerful powerband which is generally more desirable than the character of the S55. If you like a spiky more wild character you may prefer S55.