What pipe for open class motor

[KartRacer89]

So I acquired an open class flathead. Came with Dyno "400" cam (about 360 lift on both valves, which are stock diameter), Tilly HL380 carb and ARC adjustable flywheel. Block has had machine work done to deck and head, intake and exhaust ports have been opened up. Stock diameter valves. Only thing I'm missing is an exhaust to complete it, what pipe would be good with this setup on 8th mile tracks?

 

[Petty Race Engines]

Does your track have a muffler rule ?
Most open classes are exempt from muffler

 

[Petty Race Engines]

This type straight pipe

 

["J'-remy]

id do the duffer curved pipe on dynocams if they ever get it back in

 

[KartRacer89]

Does your track have a muffler rule ?
Most open classes are exempt from muffler

No muffler rule where I race at.

 

[flattop1]

15 or 16 inch .995 3 stage .with flare end .
robertson torque tube with midwest flare if you can find one .