Custom made exhaust system from a shop? Are you made of money?
Straight pipes? Newsflash:
NOBODY wants to hear a P.O.S. sounding car blatting around.
Do you know what your unmuffled car sounds like from the
OUTSIDE? I always thought that since these open-exhaust guys seem to love exhaust noise so much, they should quit playing around and route that open pipe up to within about 3" from their ears. Enjoy.
I vote for the stock style replacement muffler. No, it seems there really hasn't been any huge advances in muffler tech; fooling with mufflers accomplishes nothing for the eco-minded driver anyway. If you are racing and live in the near-redline rpm range, then.
Check local or shop Rock Auto or Summit, they are pretty tough to beat.