Several reasons; the potential hassle come mot time, wanted to quieten it down a bit, booked in at RST next week to have it tweaked to suit being catted again. I not overly comfortable running 280bhp and want it pulling back a bit and figured the most effective way was the above.
Just got back from RST. 275bhp and 290 torque. Smooth power, good afr. As a bonus the young lady upstairs is a right looker.