if you can get some ba v8 cats they can be cut down and welded on and flow really well and are a reliable brand

Got a quote back today from a place in adelaide for a full stainless system. Approx $3000, that's probably a bit of an overkill for what I need. Waiting on a quote for non stainless press bent from the locals.

I'll agree with the comment that stepped headders (try-Y's) are the way to go for a street windsor. Add these to a Lukey system (2.5 into 3" over diff) and you have a very nice sounding winsor.

A mate has taken a diffrent route, twin 2.25" mandrel from 2.5"redback cats all the way to the tail pipe. Single H pipe. Gives a nice throbbing note to it.