Originally Posted by MEGA
It will be faster with neglible mpg impact but could put extra load on the quite poor 2006 mitsubishi turbo - and in short you might end up needing a new one (But most people don't of course).
Only he mentioned the true answer.
Worth it or not, its your call OP considering the risks and benefits.
If you are going for one, its worth of trying alpina software on your car. Again search the forums as few members are running alpina's software on 320D (Pre-LCI) without any issues.