Torque means you can develop power at lower rpm. Making an engine breathe better without attention to the effects of pulse tuning, will give you an engine that needs to rev to make power. Make an engine breathe well, with effective pulse tuning and a good burn, you'll get good power at lower rpm. Upside is reliable and highly effective engines, particularly on OE ratios, downside is people that don't know how it's done, won't believe it.
Not one of my customers to my knowledge has bought one of my engines on a power claim, they've all come to me based on the performance of the engines that they've seen and until recently, I didn't publish any figures for the top spec engines, because the rolling road data I had in the past was so variable, as rolling roads tend to be. Using an engine dyno to develop then engines and the work I've been doing with John Read (JRE racing engines, people in rallying will be aware of who that is), has moved my game on massively since 2010, when Will DC's engine was built. It's also given me alot more confidence in the recorded figures and pride has eventually forced me to publish some of them. I have some pretty good yardsticks to go by on the dyno we use, from some of the best 4 cylinder engine builders in the country. I would absolutely not publish any figures that I didn't have total confidence were accurate.
Last weekend I rolling roaded a 1600 TU I built for a rally car over in Ireland. It showed 164lbft on a dyno dynamics rolling road. I know that's not accurate and a good chunk more than we saw on the dyno, but how many people will swear blind that DD rollers are accurate or low reading?!