Mild cam, twin dellortos, putting a new set of stu wilkins headers on and wondering if i should go 1.75" or 2" exhaust, just a street car so I initially went with 1.75 pipe, what do you guys think? I know the wiki says 1.75 but that was for the a12, wondering if the extra displacement a15 means wider exhaust or no

I remember doing a bit of research about this years ago and deciding on 2" for A14, weber and 4-1 extractors.

It seemed like the right flow rate to me at the time - but can't remember the actual numbers of technical reasons for my decision.

Maybe that helps you?

I had both on my a14 the 2 inch was better for performance in my opinion but they were press bent. A mandrel bent would be best

If you already have a 1.75" exhaust I'd keep using it.
If you really want a new exhaust, match the collector size on the new SWR header.