stock 05 wrx. looking biggest hp bang for the least amount of money to started
New to modding under the hood of any kind. Want to know the best places to start getting a decent balance between lower price options and best results. I know, you get what you pay for. I mean lower end cost mods that will boost HP and performance strictly under the hood.
If your car is completely stock, the best bang for your buck when it comes to increasing power is an aftermarket downpipe with some type of "Stage 2" ecu reflash. There are a number of ways to do that, so search here: Unabomber's Manifesto - NASIOC
It's debatable whether or not you need to upgrade your cat back at this point, but it's usually a good idea while you're there. Cat backs are mostly for looks and sound, but some gains can be had by upgrading to a larger, better flowing exhaust. Finally, you'll want to upgrade your stock up pipe to a catless version since the up pipes in 02-05 WRXs come with catalytic converters which tend to wear out and break down over time, sending bits of metal into your turbo and engine, causing potentially catastrophic failure. There's a little power to be gained in terms of a quicker spooling turbo, but it's mostly a safety mod.