Thanks Ace. I am pleased the information has come together nicely. My exhaust pipe supplier actually commented that he just uses 316 rod with 304 and 316, if any at all. IN a perfect world where supplies are unlimited we would use the ideal tools and parts. Exhaust piping order Thursday night arrive...

Also, my apologies, I wrote this blurb up yesterday and didn't post, as some quotes may be of interest here it is: I found a different source of flux other than Solar B the other week on the net https://www.tinmantech.com/products/welding/welding-flux/stainless-steel-welding-flux.php still perplexed...

Yep
I ordered a Y piece with valves and another flow meter last night. Less fiddly than the fabrication series budget solution.
Thanks for all comments

LOL can't argue with my own statements. That's a pretty firm NO for 309 over 308. So $40 worth of 308L it will have to be. Why the no for outperform? Is it simply because 308 is a closer chemistry to 304 or that 309 has specific weaknesses due to its chemistry? Interesting comment about the use of s...

Thanks Weldmonger and Ace much appreciated for the comprehensive feedback. Yes, pretty obvious for the best way forward as you say. I got a number of interesting responses from a local reputable exhaust system shop and a supplier of exhaust piping who worked on performance vehicles for years. Basica...

Hi I'm from Sydney Australia, country born, did some stick welding as a teenager before heading off to Uni for an electrical engineering degree. Been working in the utility industry ever since. Family is important and my hobbies are simple. I spent 5 years with my brother restoring an old 30' timber...