My floor jack is a POS. I jacked it up as far as it would go, threw a stand under it just in case the POS let go. And still couldn't crawl under there effectively. The best I can tell is it appeared that the bolt hole looked to be right at 1/2" from the center exhaust pipe hole.
The O.D. of the exhaust being ~1.50 inches. Add two 1/2 inches to that, making the bolt holes roughly 2.5 inches apart. Fummins, if you got a chance (no rush) could you confirm that? I won't hold your feet to a fire if you're not exact to the thousandth.
I'm going to have to just procure a flange that is flat. And a gasket. My exhaust guy should be able to deal with that. Best I can tell, the engine side flange has weld nuts on it, and the tailpipe side has the bolts with springs.
Actually Fummins, might you be able to confirm something else for me? Does the bolt (with spring around it) have a step / shoulder on it? It looks to me like it MUST have a shoulder on it in order to drive the flanges in contact with each other before the springs fully collapse on themselves. If it has a step / shoulder, those same bolts and springs should work with a flat flange.
Now that I think about it, it is important to use the same bolts because, if there are weld nuts on the engine side flange, I want those to remain with no modification ... so that my original exhaust can go back on easily if need be.
Fummins - I hate to ask you for these things ... you're noone's minion. But I don't know who else has ready access than you. And I can't seem to get my big ass up under my car to find out. I REALLY need a lift. Let me summarize, like the nerd that I am.
Would you:
- Confirm the exhaust flange bolt hole spacing appears to be 2.50 inches apart?
- Confirm that the engine side exhaust flange has weld nuts?
- Confirm if the exhaust flange bolts have steps / shoulders on them?
Before I Submitted the above, I decided to not be such a baby and see if I could find some info on my own.
Bolt: See picture below. It appears that bolt does have a shoulder on it. So yeah, flat flange or not, it seems that bolt and spring combo should work.
Weld Nut: See picture below. It appears that the 2020 exhaust manifold DOES have weldnuts on it. Why? Because if it did not, the nuts would be listed out on the picture below as separate items. But since there are not fasteners listed, fasteners must be part of the assembly (welded on). I guess I could spend $1,200+ and find out!
Bolt spacing: I don't know any way to confirm this, on my own.
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View my fuel log 2020 Mirage ES 1.2 manual: 42.4 mpg (US) ... 18.0 km/L ... 5.5 L/100 km ... 50.9 mpg (Imp)