I'm half way through making my own twin turbo setup (build thread here: https://my350z.com/forum/media-share...urbo-350z.html) and one thing I've not done anything with so far is the exhaust. Obviously I'll be making my own downpipe but for the rest of the system I've currently got the Invidia Gemini which is a dual 60mm diameter (2.35 inches) system. I'm running two Garrett GT2554R turbos and not going for crazy high power, just somewhere between 400 and 500 whp. Is the dual 2.35" exhaust going to limit me before I get to those kind of figures though? What size exhausts are people running that are twin turbo and dual exhaust (and what kind of power are they making) ?

Thanks

 

My initial thought is twin 2.35" is fine.

Have you heard of / read Corky Bell's Maximum Boost? There is a metric ton of solid information on turbo builds. He has a chart used for sizing turbo'd exhaust setups. I'll snap a pic and upload it (bootleg style).

If you can find it there in the UK it's worth it to pick it up and/or find a PDF copy of it. I've referenced it dozens and dozens of time after reading it.

 

 

Thanks for the replies. I think I'm gonna bite the bullet and just get a dual 2.5 now anyway to save any headaches in the future when I inevitably want more power lol