Spec class? Cheat class. I have a certain set of skills, that when needed, allow me to wreak devastation upon the innocent and unsuspecting. And I would run that spec class. Tear me down? Hah, tear everyone down. That'll be real popular when it's beer time.
Number one rule in lawnmower racing: There is no one enforcing the rules.
That may be at some tracks.
I run tech at our track and I do enforce the rules. I know these engines inside and out and can tell you that the people we run with will not try and cheat. If I find one that tries to push the rules I tell them to fix it or they are not racing. I have the time , the beer,and the tools in my trailer if needed. Just ask anyone in our club if I would do it. I know I have DQ'ed almost averyone at one time or another for something in these classes.