FWIW Kpower's car weighed in at 2673lbs with the swap. When Pure Automotive did their swap they came in at 2612lbs with the S2K trans. ..So the weight isn't crazy light or unrealistic no matter how many apples one puts under the hood.lol
Best I could find on weights for both
fully dressed engines is ~360lbs of apples for FA20 and ~285lbs of apples for K24A. Many apples here folks.
It should be noted that KPower mentions weight savings of the swap in: intake manifold, oil pan, oil pump, exhaust header and Ill add balance shaft removable as that is done in a Type-S oil pump upgrade. These have to happen so the swap can happen btw. All saving weight vs a bone stock OEM straight out of a TSX K24A2. Now subtract the 70-75lb of difference in dressed long blocks between both OEM standard engines. Probably nearing 100lbs already, yeah?
There isn't an apples to apples comparison because it became an orange in order to be installed.