Exhaust system requirements for a C20LET

[vx kev]

Just wondering whats peoples opinions or knowledge is on exhaust systems for a c20let nova.
Say its running phase 2 (no higher) with FMIC etc.
So does it absolutely need to be a minimum 2.5" system or would it be just as happy running a 2" system?
Whats your thoughts/ideas?

[matthew172]

wants to be more than 2" for deffo, most run 3"

[blue_peg_16v]

2.5 inch from turbo back min imo

[Lee H]

2.25" would be ok I reckon as that's what a standard Calibra system is.

Standard downpipe is only that size so unless you replaced that as well there wouldn't be much point fitting a bigger system after it.

[Will F]

As lee said 2.25 would be fine. But would restrict it above 250, so phase 2 would be the limit really...

[Mieran]

I used standard downpipe (2.25") connected to ashley system (also 2.25") and ran fine on ph2, engine did have 3" previously and it was just as fast with the 2.25"

[GDN16v]

Pointless doing 2.25, just go for a 2.5 inch system!

[Plug]

I got a 2.5" system made up for my let and it's fine, rather tight fit following
Original nova run mind,

I gave my local power flow £200 from downpipe to back box

[vx kev]

Thanks guys, ive priced a custom system from a local fabricators who recommended 2.5" but was really just wondering if there was something of a useful size off the shelf that could be modded to fit. It seems the biggest size you get for the nova is 2" system and yet Jetex do a corsa b system that is 2.25 or 2.5".