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do you still have the HISSING sound when RPMS are coming back down when you let off the gas.
Yes, there is a hiss. Its only when the RPM fall below around 1300 and at very slow speeds. Say 5-15 mph. You can't hear it in the car unless the windows are down, A/C is off, and the music is off.
Jack. Wish i had more info for you like dyno sheets and such. All i have to go in is whats on their website which i posted in my 1st post and also if you search for Kinetix on here or the 370z forum it seems there are plenty of people happy with them. With the increased horsepower there should also be increased torque. Just let me know if you are interested and ill add you.