In the State of Utah, exhaust and noise regulations are regulated by the Utah Highway Patrol. It must be the same in the Commonwealth of Pennsylvania. Call the Highway Patrol in your state; ask for a Safety Inspector. He or she will have all the answers you need.
exhaust tip or glasspack it
By adding a dual exhaust and/or exhaust headers either short or long tubes for sound and performance
While listening to Impreza exhaust sounds is not common, there are sites that have the sound. Check out YouTube for videos with the sound to listen to.
Attach a bigger sports exhaust, simpler enough
Put in a Borla cat-back exhaust, you will be greatly satisfied.
Exhaust leak at Exhaust manifold to head gasket or oring at exhaust manifold pipe.
yes
In Pennsylvania, it is illegal to operate a motor vehicle with a modified exhaust system that makes excessive noise or does not meet state regulations. This can include straight pipes that do not have proper mufflers or catalytic converters. Violating these laws can result in fines and penalties.
The exhaust system is what muffles the engine sound keeps the fumes out of vehicle and away from the vehicles occupants and also filters the exhaust fumes out.
Well, any change to flow of the exhaust gases will change their sound. That said, how much of a change in sound depends on how much you change the flow. Tips, normally go over an exhaust pipe and perhaps extend it a very small amount. It is unlikely this would cause much change...up or down.
Leak in the exhaust system?
buy a performance muffler