Hi, new guy here with a new to me 2013 WRX 2.5L Hatchback. The car is in wonderful condition except for one little detail. The engine runs but sounds like it's on the verge of catastrophic failure. I bought it from an acquaintance who bought it new (I paid $1,000 for the car). 150K on the Odo. It shifts and rides beautifully. I've driven it very cautiously about 2 miles and won't start it again until an engine swap or rebuild happens which leads me to my question. I was going to buy a low mile, used JDM engine (cheap and easy swap out) but found out the 2.5 is a US spec engine and not available from Japan. Will a 2.0 replacement plug and play in my car? Is the drop in HP that much? I can buy one with less than 60K miles for dirt cheap. Thanks for your expert advice!