^^ What laborsmith means is to get the most out of the cutout, the resonator on that exhaust should be removed and a new section of pipe with cutout should be installed in it's place before the muffler/resonator. The resonator, if you'd like to keep it, can be welded in farther down in the exhaust, but would be pricey vs just ditching the resonator.
The cutouts with bolt-on covers and gaskets at the flange are the best (not wing-nut, not auto-solenoid activated). These are primarily used for street/drag cars that must have mufflers in order to be legal for inspection. In my experience these leak the least, but all of them will eventually leak :blankface: Maybe others have had better luck than me. If I understand you correct, and this is after the primary cat, then leaking won't matter for emissions purposes. On my drag cars I've always bought one aftermarket and had a local welder/friend weld them in for me.
Get something like this:
Robot Check
... and have the welder make a thicker cover for the flange for you than these wimpy ones:
QTP Quicktime Performance 10225 Stainless Steel Manual Exhaust Cutout 2 25" | eBay
If the auto one starts to leak and drone, just bolt on the thick one in place for a while.
Stay far away from the ones with built-in valves, like these:
https://www.opgi.com/gto/CH24872/
Electric Cut-Out 2.5? Exhaust System
This is just my perspective, I don't want to dissuade you, if you like the sound, and if you have the money go for it, it'd be fun!
