Exhaust Questions

[32valvZ]

So we finally had a custom exhaust shop open in my area... very fortuitous for us both since I need some work done...

I have Watson headers in already and 2 new MF bullet cats I would like installed, and then an X pipe.

Looks like there are several choices for the X pipe on the SW site... not sure which to order

https://stainlessworks.net/products/exhaust-builds/x-pipes

Questions:
1. What size 2.5 or 3.0"
2. Placement of said X pipe
3. Where do you guys typically clamp vs weld?

Id like to see some pics you guys might have of a finished system with headers, cats & X pipe if you have...

Thanks, John