I believe the Troublemaker is being flown in SPA events. I's certainly not the most popular choice, but it is out there. Yours is a very good looking model. If you like the way it flys, by all means convert it to SPA standards (fixed gear, no tuned pipe). I like the way mine flew back in the day.

BTW: Is yours the standard Troublemaker or the "extended" version? They're both SPA eligible as far as I know.

Greg