Quote:
Originally Posted by 2011 Nismo#91
So saying the FI exhaust addes 20hp to a Z seems about right, 10hp (as apposed to 8hp) or so because it's slightly larger and less restrictive with the other 10hp coming form the Tune.
So you better really like that sound because your paying alot of money for 2hp and losing a lot on selling a used exhaust.
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Your math is a bit off. A stock (no tune) 370z will net 15-20hp to the wheels with a FI exhaust. This was not only proven by Fast Intentions but also by fellow Z members here when the exhaust first hit the market. So the difference between the NISMO exhaust and the FI exhaust is actually 7-12hp depending on car/dyno.
On either a regular 370z or NISMO 370z a change of the exhaust system does not warrant a tune. Getting a tune will yield next to no gains in the higher rpms. Maybe under the curve but not the total. The tune is only important when you start talking about CAI, CBE, HFC, etc in combinations.
Now 7-12hp for the 1600+ the exhaust costs is a bit expensive vs. gaining 15-20 for a regular 370z. But you are definitely getting more than 2hp gain. Plus the NISMO exhaust is just way too quiet.
But yes, the NISMO gains 7-8hp from the exhaust, the rest comes from the tune and part of that is a higher redline. Even a stock 332hp Z, if you raised the redline to equal that of the NISMO it would rate at a higher hp reading. Nissan cut the rpm to protect the engine but stock dyno graphs show the HP line still trending up typically past redline.