This is an obvious one; take a 707-horsepower (527-kilowatt) Hellcat crate engine, and shove it into an outgoing JK Wrangler. Simple. A few shops have already done it, but making an all-out Wrangler Hellcat on your own might be pricey.
KBB estimates that a lightly used, entry-level 2008 JK Wrangler will set you back around $13,000. Add on the price of a Hellcat crate engine – $19,350 (not including the $2,195 kit) – and you’ll be staring down the barrel of a $34,000 project… not including labor costs. If you don’t want to do it yourself, Dakota Customs out of South Dakota will sell you a converted Hellcat Wrangler for $56,000.