Holding up to the power is not an issue; there are plenty of big turbo ST's making 400-500 hp and more. The issue is that the only thing that is truly interchangeable is the engine/transmission. The fuel tanks are in different locations (the ST's is under the back seat where the drive line would need to go), the rear differential will not bolt in so the sub-frame would need much fabrication and I would imagine most of the electronics don't match. Now, if someone had an RS engine/trans/differential, all of the electronics, excellent fabrication skills, lots of time and patience and a large budget for all of the incidentals, it could be feasible.Well it actually isn't mind blowing because it all bolts up because it is interchangeable. Just a matter of making it hold up to some of the power levels in these newer setups.