the NISMO exhaust is actually kind of crappy in terms of performance and tame in terms of sound. The first week of ownership I swapped out the exhaust for fast intentions with 18 inch resonators and carbon fiber mufflers. Much better in sound while not annoyingly loud and gained more power too. Test pipes, high flow cats, and headers are another way to go while keeping the stock NISMO exhuast. Personally headers is too much trouble. With high flow cats there are still people who have issues with throwing a CEL. And with test pipes you have to worry about swapping them at time of smog. Changing the exhaust was just easier. I mean the other mods aren't that big of a pain but having come from doing years of modding of my 280z and 300zx I wanted to go more low key with my 370z.
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