split your exhaust in 2 after the crossover or install a high flow converter and split after that and install a performance muffler like flomax, or my personal favorite thrush glass packs. The older they get the better they sound, I like to help out the aging process by torching out the fiberglass before install, did this on my 66 pony and got a real nice rumble out of her.
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
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
It muffles the sound of exhaust rushing out the pipes