I've brought my moped into the engineering department at school to remove the exhaust restrictor plate, and I've put it up so I can get underneath it but when I try to undo the bolts between the exhaust and the engine, they won't budge.
The only option I have is to use allen keys, which I have the right size, but I've put a ton of strength into it and still neither of the two bolts will come out. Any advice on getting these stubborn bolts to budge?

Thanks,

AcharyA.