I think the shaker and those exhaust upgrades are just going to be negligible at best. I don't think it would register much on the "Seat-of-Your-Pants-Meter" and barely a blip on a dyno. Camming and ditching that restrictive transverse muffler will do much more performance wise. I've always stayed away from aftermarket exhaust myself for originality reasons, but I think that would be a good route for increasing performance and opening the car up to future upgrades if that didn't bother you.
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