I have the A8/TT brake conversion with power stop crossed drilled rotors and ebc red stuff pads and it is time to get new pads is there a way I can use TT pads since there are slightly bigger or am i stuck with the smaller a4 pads?

the brake pad wear sensor is not an issue with me since i have bypassed them

 

you've got the A4 calipers......therefore you use the A4 pads......

 

If you had blank rotors, you'd have more pad contact area and more stopping power with the "small" A4 pads.

Just get a good compound like Hawk HPS and you'll be fine. They stop a lot better than the EBC RedStuffs.

And seriously, blank OE, Zimmerman, or ATE rotors will give you more stopping power than the cross-drilled Power Stops.