Originally Posted by Sales@F.I. Inc.

When you purchase our twin turbo system, we can build your down pipes in 1 or 2 different connection sizes:

- Full 3" diameter for connection with our 3" TT-TDX twin turbo exhaust.

- 3" diameter tapered down to end in 2.5" for connection with our 2.5" TDX exhaust system.

All options can be found here : 370Z Twin Turbo System

To follow up TerrribleOne's post, our 2.5" diameter exhaust system capable of supporting over 600whp.

If you have any questions, please don't hesitate to ask.

Thanks,

- Kevin