Is there a cheap way to test for sound? I was working out the exhaust system on the ITB MR2 and was thinking on running a 2" hushmaster on it. I don't want to weld it up, then find out that it is completely useless since if it don't pass sound. Since it's first trip will be to RRR I don't want to get kicked out, or worse fined. I want to say it is 103db limit there.