Blokes,
As we know, Toyota and others tune some of their 4x4 engines down, mostly turbo diesels I think, so that they're under relatively low levels of stress and therefore more reliable and last longer.
Does anyone have experience with aftermarket tunes for these kinds of things? Figures seem to be anywhere between 25% - 50% increase in torque.
In a nutshell I guess the question is how far can you increase the torque/power while maintaining majority of the reliability.
10%, 20%, what are peoples opinions.