Originally Posted by Quartermaine

Put on berk hfc and it is an amazing combo with oem Nismo cbe. It sounds deeper than stock but not loud enough to attract police attention. It sounds great at wot. No drone on the freeway at any speed. In fact, you can't hear it over the road noise (roadster) and/or your music. Love it!

Oh, the mid range dramatically improved as well. Butt dyno approves