1. Neither one is a real AMG car.<br> <br> 2. If you want an affordable AMG car, look at the C36 -- they are becoming available around $20,000.<br> <br> 3. I doubt a 560 would fit in a 190 engine bay. Unless you're a very skilled mechanic and have lots of time, IMO it's a waste of time and $$ to try to substitute engines -- the transmission may well have to be replaced to handle additional torque, the engine electronics will be different, the brakes and suspension will probably need upgrading, the additional weight of the bigger engine will change the handling dynamics, etc. For what's probably close to the same amount of $$, you can get a C36 and have a real AMG car that's been properly thought out and put together [and won't be wearing a fake AMG badge].<br> <br> 4. Alternatively, buy an E420 and put in a Kleemann supercharger and Kleemann suspension for $18,000 plus $2,500 -- supercar performance for under $40,000. See http://www.mbautowerks.com/performance/00003/00003.html