Originally Posted by bawareca

There are more things to it,but let's not begin this discussion again. I hope you realize that the piggyback tuning,especially on a diesel,is a huge nothing.Mostly it gives you a bit more fuel and bit more boost resulting in a good punch at low RPM.But the main downside is that the US diesel pulls strong to ~3200 RPM and then it gets progressively weak.With the flash tune we are developing, currently my X5 pulls strong all the way to 4800 RPM,without increase in boost after 3400 RPM.As a matter of fact we cannot reach even the factory boost treshold @3500-4800 RPM,but it pulls strong all the way to the redline on all gears.
But the diesel here in the US is so inefficient because of all the emission stuff.But once some eco features removed i am pretty sure it will gain 3-5 mpg and easily 350whp/500wtq on all stock parts without even been close to the limit.Expect some real world results soon