Engine swaps are still available, with some slight tweaks. The 5.7L V8 has been replaced in most cases with a 400+ hp 6.0L V8 and a 707 hp supercharged V8 is now available for a few Dodge cars as a swap.
The 2.6L TT I6 and some of the other more famous tuner engines have gotten horsepower bumps when you upgrade them…