Hey guys, i was the one who posted about them. I also have a indy 500 and wanted to put them on. I didn't really get much response about them but i heard that the are incredible!!!!!! if you tune them right and they take a long long time to tune. I believe that you sled being finiky could be in relation to the pipes. Because an indy 500 is a trail sled, and pipes are more for higher HP sleds. also the UFO's can outpreform flatslides if they are set up right. But if since the UFO's need lots of tuning, and the pipes need some too. Then that could led to the finikyness of your sled, expecialy since its an indy 500 and not more of a preformance sled.