Just giving them ****, and it's pretty common for people to make outlandish HP claims with LS motors and they commonly say they just have a can and a tune.
My favorite wheeling videos on YouTube these days are of guys in stock Willy's riding through the woods. I think Jpetrowich is the main guy and there's a dude with Grampas Jeep that really got me hooked. It's amazing what they'll do with some lockers.
If there was ever a competition for baddest "trail" buggy I think this thing would have to win. Never seen it in person but it just seems like it has everything you would want in a buggy that you want to take out for a weekend.