Theres a PPP exhaust manifold in the for sale section, IMO the best you can get very well made piece of kit, also depends on your current exhaust system diameter not much point fitting a 4 branch with a 63mm outlet onto a 51mm stock system,
An old PSD manifold is an option similar to the first phase PPP manifolds but they are rarely for sale
Then there's the raceland ones which i have no experience of, others will be able to help out with those though,
hope this helps
josh