Hi Andy
I have a Sumo/Chevy and have just replaced my sidepipes as I wanted a 4 branch to improve the gass flow.
I have the original Pilgrim supplied stainless pipes [same as a car is born...]
I'm sure Tony can provide manifolds to suit your V6 very cost effectivley.
I still need to clean one of the pipes as stainless does loose it's shine after a while, but otherwise they are in good condition.
Let me know if you are interested and I'll send you some pic's.
You can see them on my car @
www.munderhill.co.uk