I've got the Hi Power on my Nismo. When my car was supercharged, I upgraded my supercharger and while it picked up a ton more boost, it lost hp. While trying to figure out if there was a restriction somewhere. The shop that built and tuned it disconnected the exhaust and ran it on the dyno. It only gained a few hp with the exhaust disconnected. With my FI tt kit, the car made 745whp with the Hi Power. I love the exhaust. Quiet, no drone and has a great tone.
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Fast Intentions "Stage Seb" twin turbo #098- Specialty Z/Tial-Xonarotor/CJM/Ecutek/HKS/KW/SPL/Hotchkis/Rohana/Toyo
700+whp
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