none of the things you mention will affect emissions.
I like the borla, but You can also just order up the piping and mandrel bends (2.25") weld em up or a 2.5" crush bent and with a straight through muff you're golden.
Obx is the cheapest from ebay be patiant and search for "cavalier headers" got mine for just over $150 shipped. Best is stan, but you're gonna pay.
ditto oldsman on everything else, but you need to do some mods to the HO manifold including a some TIG welds.
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