Having an OEM muffler defeats the purpose of the exhaust piping. It's like boosting water through a coffee stirrer versus through a straw. There are options that are still extremely quiet but also allow a higher flow. Apexi, rsr, magnaflow, vibrant and others have street silencer mufflers with good flow porperties.
You'll have a deeper than stock sound even with the OEM muffler since you have a header and larger exhaust piping anyway
You'll have a deeper than stock sound even with the OEM muffler since you have a header and larger exhaust piping anyway