A K&N filter is fairly simple to install.
You should consider doing this yourself, but if you had a shop do it for you, I can't imagine they would charge more than $10.
Duel exhaust installation would probably take about two hours at best. Figure around $50. per hour labor as a rule - could be a bit more depending where you live.
Parts; (H-pipe, mufflers, tailpipes, etc) can run $300. or better, so this could easily be a $400. to $500. job.
I don't have parts information handy so I can't give you precise numbers, but a call to a good muffler shop might be a good idea.
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