IMHO, now is the worst time to be blindly trying to upgrade the exhaust.
If you carefully re-read some of Jake Raby's posts on the subject, there do not appear to be many exhaust systems out there which outperform the stock factory setup. Easy to blow $2k and get a reduction in performance, more than wasting your time and money.
If it were me, I'd wait a few weeks until Jake reports more of his ongoing research on the matter.
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