I know the situation you are in, too. A little bit of it is guilt because you don't like that your significant other no longer likes riding in the Z with you because of the exhaust. When she's in the car with you, you feel bad because you know she's bothered.
But when you are alone, you enjoy it.
Instead of wasting money, just let time pass and you will get over it and it will get better. Don't let the guilt get to you.
Yeah, it sucks that my car gives my girlfriend headaches.... but have you heard how f'ing awesome it sounds? Priorities.
