Don't know but I'd suspect the NA diesel's exhaust temps would be close but a little bit less than the turbo diesels. The 1.6lTD runs pre-turbine EGTS of 1500 deg. F and 1300 deg. F post-turbine.
I am running some aluminum pieces on my exhaust, but it's only under the car at around the shifter boot or farther back (at the end tailpipe also.) so there is an opporunity for things to cool off. Also my EGTs are much cooler with a large exhaust system and intercooler. So far the aluminum is working OK (I have done some autocrossing and highway driving on it) no fracturing, melting, bending, etc. so far.
But I also haven't done a real good test yet that would really put the temps into it (IE: powering up a long mountain grade on a long road-trip.) It is 6061-T6. The local muffler shop was even able to cold-work it a little bit (but a couple bends into one piece, and flared the ends for slip-joint connections.) It wasn't as hard to cold work as I thought it might be! It is much lighter than the 304 stainless pipe it replaced (my main reason for experimenting with the aluminum.) A 1.6lNA works well with 2.0" OD exhaust system. (2.25" works as well and gives better upgradeability for a turbo also.)
Thanks for the info. I guess I'll try it. I'll be starting with the aluminum after the header flex jointl, about half way between the shifter boot and the firewall, and I was going to run it all the way to the tail pipe outlet.
I've also got an old aluminum Supertrapp with a 1.75" ID inlet from an old 3 wheel ATV I used to have. That will slip right on the end of my pipe. I'll probably need a few more plates for it (less restriction, not quite as quiet), but those are easy enough to get. If I had any 2" material and a 2" die set for my bender, I'd consider that, but I have a 1.75" die set for the bender and the 1.75" material is already here (a 10 foot scrap from a previous project, basically free), so I'll try that first.
Heck, if the front part of the pipe melts, I'll just cut off enough for a piece of stainless to go a little beyond the melted part and re-flare it.