2.5 hours for a bolt on exhaust seems pretty extreme. It's less than 1 hour if you take your sweet time and includes unpacking the shipping box.
HFC time is fair. Can be a lot shorter if things go well. They are removing the stock airboxes anyway for the intake so that does make things easier.
Intake time is too high as well, especially if they've done one before. It takes 2 hours if you've never done it and have to figure out where everything goes.
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