You can make anything fit with enough money
That said, it shouldn't be too hard to make the rear section fit. I wouldn't expect it to bolt straight up, so you might need to get a new mid-section made to join the headers/collector/downpipe to the rear HKS section, AND you'll probably have to get the exhaust hanger positions changed (on the exhaust) for it to hang correctly.
There's no reason it can't be done. A whole custom exhaust should be under $400 for this car, doing a couple of mods to an exhaust you already have should be much cheaper.
As for whether or not that will reduce power/torque.... Probably... 3" is FAR too big for a 2.0L like this IMO. BUT, because you'd only be changing the rear section, it should still be ok, as an exhaust only flows as much as it's smallest part will - ie. the restriction would still exist in smaller mid-section, so you'd still get a decent amount of backpressure.