My buddy and I did a California BAR swap of a k20a2 into a civic EG. The things a ripper.
We also had to bring over all the emission EVAP stuff, for the evap on the RSX tank (plastic irrc) we bought a new EG tank and welded all the necessary fittings to get it to work.
I was looking at buying something similar on cars and bids a couple of years back that didn't have cats, so I looked into the law in ny. I've been in a stripped eg with a similar motor at an autocross and it does rip. Loose rear and front grip with an 8200rpm redline? Heck yeah. Would recommend looking up your nearest scca and going out for a day to see what it does at the limit