Assuming you're saying without a tune...because with a tune, it's an 20hp gain, not 4. I only mention this as once I started modifying my car (which has basically the same exhaust) from OEM, the air/fuel ratios were ridiculously rich. Needed a tune to optimize the parts. I would suspect that it would be the same going from a stock non-Nismo exhaust to a Nismo.
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'13 Audi RS5 Misano w/mods-The Red Mist
'13 G37 IPL-SOLD
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