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the stock exhaust is limited, they crimp the hell out of it which restricts the air-flow, an after market exhaust will give at least 15 hp gains. Just lay under your car, you can see the awful injustice Nissan has done to this exhaust. A cheaper way rather than buying a cat back system is to replace the pipes from the cat back, should give you nice gains and will be much less expensive.
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street scene grilles, top and bottom color coded to my paint... AEM CAI, OEM carbon fiber hood, AXXTION STS, Magnaflow exhaust from the cat back, Stillen grounding kit, Eibach pro kit springs, RO_JA R2-5 wheels(19 x 8.5) with Toyo T1R rubber(245/35/19), stillen cross drilled rotors with hawk pads, stillen strut bar, completely de-badged, and pioneer Avic-D3 head unit with all the bells and whistles.
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