Question for PA folks: Thru-the-fender exhaust legal?

I'm so glad that I live in Florida.
My older brother who still lives in Ohio could not get plates for his Audi because it could not pass the dynamometer emissions test.
Why??? .....because the dyno only had 1 set of rollers and he drove a Audi Quattro. It only took 4 months to get that mess straightened out. It is nice to have a friend that owns a used car lot. Dealer tags work great.