from what i understand the tre make the box think its in 5th gear all the time gives you more advance in lower gears and lower rpm range. the ign moduel changes advance all the way through, you can either advance or retard ign and if you really want to get trick you can change timeing on each cyl differently. then you also have over rev option.
I have a tre and have read how they both work I just wasnt sure if the tre would interfear with the ignition module. By the way they they each work I wouldnt think they would but I was checking befor ordering the module. Was wondering if anyone had experence with both.
The Ign. Mod. can't do the same thing as Ivans TRE but the two can be used together. That's what I did. And the TRE doesn't do that on the 10R, it just gets rid of the fuel shutoff on decel to make corner entry smoother.