This 10,000-RPM Four-Cylinder Makes 325 HP Without Any Boost

When you have 16 valves, ITBs, and billet everything, you don't need a turbo to hit your power goals.

This Mighty Four-Cylinder Engine Revs Like a Lambo but Is Built for Boreham's Mk 1 Ford Escort RS

Along with a 10,000-rpm redline, this 2.1-liter inline-four packs 325 horses and will power a historic Ford Escort ...