EXHAUST
A hotly debated subject on the Altima Boards. It comes down to this, the bigger you go, the more power you can make. 3ich Cat backs have been shown to make Power at the upper Rpm range, and lose no low-end power, BUT they can reduce throttle response, and don’t make as much low/mid range power as smaller piping. Meaning, at part throttle daily Driving, you’ll feel like you lost a lot of power. Altima drivers have long used 2.25, but even that may be too small for optimal breathing. 2.5 seem like the Best compromise between 3.0 and 2.25. It offers superior low-end power, and excellent top end. Though, because of the bigger size, 2.5 might be louder than 2.25. In the end it comes down to preference. If you want maximum power, go 3inch, if you want to keep things quiet, go 2.25. If you want the best of both worlds, go 2.5. Of course, all piping should be mandrel bent for the best flow.
Highs:
Good power increase (all)
Large top end gains (3.0)
Good sound (all…varies)
Part throttle power (2.25 mostly. 2.5)
Lows:
Cost
Noise level (2.5 – 3.0 Mostly depends on setup)
Most Exhaust made for Altima only offer smaller size piping
Best Choices:
OBX (2.25)
Greddy (2.35)
VRS (2.5/3.0)
Custom (x.xx)
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