I understand that perfectly, as I could tell that the bolts must have a step / shoulder on them (without having seen them uninstalled), or the springs would be crushed down until they were ... how say ... gapless.
Meaning, there'd be no gap between the spring coils (once fully installed) if there weren't a step on the bolt that bottomed on a flange. It would be pointless to have the springs, if the bolt bottomed on the flange with the springs. The springs control the flange to gasket pressure (evidently, I assume).
The repair kit flange works the same way. Probably will retro fit perfectly, if the hole spacing works. If it doesn't, I'll fire up the mill and MAKE it work.
I've now ordered the repair flange AND the glasspack.
I'm going to be embarrassed as hell getting data. But little electronic gizmos in the car, including smart phone apps, are just NOT as accurate / consistent as trap speed at the drag strip. And the power change (up or down) is going to be so small, accuracy will be required.
I'm going to print out a window message, to let them know, in some way, that I'm there for data, not for racing. I don't know how to word it ... any suggestions? Some kind of message that means the OPPOSITE of "will run for pinks!"
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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)