12. Porsche 911
One of the most important characteristics of any Porsche 911 is that flat-six engine they mounted way back over the rear wheels. However, over the years, numerous owners have managed to install a big old American V8 for even better performance and top speed.
You may wonder how that is possible when the weight balance of a classic 911 is not that great with so much weight on the rear. However, the V8 conversion job puts the engine a bit towards the passenger compartment, so it doesn’t upset the balance of the chassis. Many companies sell kits, so if you own an old 911 with a blown engine, give it a try.