[Aussie Mike]

Thanks Michael,

One thing I didn't mention, the side pipes I'm building are my own design and are re packable. They also have cat converters inside them. We have some strict emissions laws down here and big fines for offenders. I'm building the sidepipes so I can slip off the outer body and repack them or change the baffles completely.

1 inch from the body sounds good. I thought I'd have to have them further away. An inch of clearance means I'll be able to tuck them well in and out of the way.

I'm machining up square flanges from 10mm plate for the side pipes to bolt to as well. It seems like the best way to me as I figure there is a better chance of them staying sealed this way.

Cheers