The thing about the TR6 is that it isn't necessarily the type of part that has a "horsepower number" next to it...meaning like, when you go to look for an intercooler, or some ported heads, you know that there are typically advertised "numbers" or how much horsepower you can expect to gain by adding those parts on your car, because they have a direct effect on the engine's ability to make power.
The TR6 is not like that, yet it does add power and benefits to the car. Think of it kinda like a PTC 9.5" converter...adding a PTC 9.5" isn't going to give you anymore horsepower or cause your engine to all of a sudden make more power, but instead what it will do, is help your engine spool up the turbo quicker than any other converter will do. If the turbo spools quicker, then the engine gets in it's power faster, which means you are making more horsepower faster than the same car with a different converter...and if you get into your power quicker than someone else, your car will accelerate harder, faster than the other car, and you will win your races. The PTC doesn't have a "horsepower number" attached to it, but it does have an effect on your car's ability to make power through how it helps with the spooling of your turbo quicker than other converters (that is just 1 of the many advantages of the PTC converter, btw)
The TR6 allows for a hotter spark, which allows for a more powerful combustion (other things affect this as well) which leads to more power. Also has a 2step that allows you launch consistently and with the car floored. More consistent launches + launching at the right rpm will allow you to spool up quicker, which gets you into power quicker.
I dunno if this all makes sense, so please let me know and I'll clarify it.