Nismo vs Stock Axle Back only.

Originally Posted by Bullit79

There's a DIY where a guy cut open a Nismo muffler to make it less restrictive (and louder). From the looks of the internals, it looks like a pretty standard muffler design so my GUESS it that the Nismo muffler is not any less restrictive than the Base muffler.

Link: DIY - Modified NISMO Exhaust - better sound, better power

I had the OEM Nismo cat back on my Base for a couple months. At WOT it honestly didn't sound much louder than stock. I noticed more of a difference while cruising / lower RPMs. It's a tad louder and has a slightly deeper tone to it. I read one thread suggesting it was the dual pipe design of the Nismo that attributed to the sound difference, not so much the muffler. Hope this helps.

Originally Posted by luigi90210

the nismo muffler is a better flowing muffler than the base Z, you can google around for the flow pattern, it just isnt louder than base