FI TDX catback dB levels - Nissan 350Z Forum, Nissan 370Z Tech Forums
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post #1 of 2 (permalink) Old 05-25-2016, 09:19 PM Thread Starter
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Thumbs up FI TDX catback dB levels

Okay, ladies and germs, THIS is what a sports car should sound like. I loved the exhaust note of my 350Z, but with all the great improvements in the 370Z I think Nissan dropped the ball by making the exhaust too quiet.

After consulting these forums (and thank you my brothers and sisters for your dedication) I decided on the Fast Intentions TDX catback as a solution. I didn't mind the three months to receive it -- good things come to those that wait.

I used my iPhone app Decibel 10th to compare the sound levels before and after. The ambient level in my garage is 55 dB.

Stock exhaust at idle:
Cockpit = 70-72 dB
Rear, 10 feet = 71-73 dB
Rear, 3 feet = 75-77 dB

TDX exhaust at idle:
Cockpit = 70-72 dB
Rear, 10 feet = 75-77 dB
Rear, 3 feet = 80-82 dB

I have the 12" resonators. When I picked it up this afternoon after the install and hit the start button, I had the biggest grin on my face ever. Such a beautiful sound. What I like is that at idle it is pretty quiet, just throaty. And cruising you don't get 'loud' unless you're accelerating. And boy, when you accelerate you get that feeling of money well spent. I appreciate that FI reports hp gains, but I can't say my butt-dyno registered any. But the sound made upon acceleration makes me feel like I'm going faster. At least I'm enjoying the trip more!

Thanks to Fast Intentions for a great product.

- Jeff
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post #2 of 2 (permalink) Old 05-25-2016, 09:41 PM
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Glad you are happy with the sound of your FI cat back.
Any plans to add some HFC's to the mix?
It will be a bit louder. But,you may realize some additional
HP gains that you can feel.
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