M54b25 -> M54b30 is pretty close to M50 -> S50... (unless you're talking euro version). Nonetheless, a 41-51hp increase in horsepower is not insignificant, especially when you're starting with 184. That's a 22-28% increase in power. The torque delta is similar in magnitude as well. IMO that's more than enough to be considered night and day.
Originally Posted by Kubica
Lol. It's not an S54. That's about the smallest power gain imaginable from a whole motor swap.
M54-> S54 = night and day
M20-> S52 = night and day
M50-> S50 = night and day
M54-> M54 = nice little upgrade
Last edited by TerraPhantm; 01-12-2013 at 12:36 AM.