Its real, I'm the second car with this setup with similar results. Mine are a little higher due to the rest of my exhaust though.
The car isn't registered for the street, but I snuck it out for a quick run from 1st through 4th gears and it definitely feels much more powerful. Find out for sure when I go back to the track next month.
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NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z
Porsche: 93 968 / 23 Macan GTS / 93 968
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