I'm about to throw a set of TR590 cams in my 103. I have an '07 Roadglide. Currently it's a Headquarters 103ST with HQ575 cams, 10.5:1, 205ccp, flat tops, stock TB, stock injectors, w/ a Bassani Road Rage. Last March on RC Cycles dyno it made 112hp 122tq SAE. The bike runs great and is very quick up to about 4500 rpm. Kind of levels off after that, but is still a blast to ride. The reason I am wanting to try the T-Man stuff out is:
1) A friend in Texas was running a HQ120. He swapped the HQ575 for the TR590 and couldn't believe the difference. It started easier (later intake close), revved faster, and pulled hard all the way to redline. I know there is a big difference in his 120 to my 103, but I trust him and am willing to try.
2) I like to play around and have been itching to try something along these lines. If I don't like them I'll sell them and throw the 575 cams back in.