I will go for a stage 1 upgrade once the sunshine has stopped - does it make much difference whether it is an MMC, Krazy Horse or Garage 56 ?
In terms of freeing up the exhaust flow no; the differences are in essence cosmetic and sound.
There are probably small performance differences between the 3 but for general driving I would doubt you'll be able to notice the difference.
As it's a quick upgrade, I'd get it done whilst the sun is shining to make the most of it......
