u/Andrez_993

- Tomei JP V2 headers
- Berk resonated TP
- R1 Titan Amuse Y-Pipe
- R1 Titan Amuse Muffler

What a lovely machine

Hey guys,

I’m trying to diagnose a persistent issue on my 2006 350Z RevUp (VQ35DE) and would appreciate some input from people with similar setups.

Current setup:

- Tomei V2 JPN headers

- Berk resonated test pipes

- Amuse R1 Titan Y-pipe

- Amuse R1 Titan muffler

The car runs well, but I have a noticeable hissing / air-leak type sound during deceleration (around 2500–1600 rpm).

At the moment, i have Berk gasket between header and TP, chinese gaskets between TP and Y-pipe and Y-pipe - muffler.

Important note:

When I previously ran a full Tomei exhaust setup (Y-pipe + catback included), I did NOT have this issue.

My questions:

- Do you think this hiss is more likely a small exhaust leak rather than a design characteristic of the setup?

-Could upgrading to OEM Nissan (Headers-> TP) + CZP thick gaskets realistically solve this issue?

- Or would it make more sense to replace the Berk resonated test pipes with Helmholtz-style resonated test pipes (like Helmz / ART type) to smooth out the sound?

Any experience with similar setups would be really appreciated.

Thanks in advance 🙏