What kind of baffling did you put inside the single chamber unit at the top?
The deal with boxster mufflers has always been annoying to downright deafening cabin resonance in the 2-3k rpm range. If you can produce a louder muffler than stock with no cabin resonance, I swear you will become a millionaire overnight if you don't charge people $1500 or more for it.
Oh yeah, you better dyno the car before and after installation with the same atmospheric conditions to ensure you don't lose HP or torque over any part of the bandwidth.
|