So I'm brand new to Subarus and I jumped into the deep end by buying an already modified 2001 WRX making 346 bhp on the Dyno. I want to make sure I maintain it properly, so what should my maintenance intervals be for oil changes/fluids, spark plugs etc? Any recommendations for oil type/brand?

It only has 65k miles io it and is a blast to drive, and I'd like to keep it that way.

 

well your gearbox is gonna be pushed hard at that power level so treat it with som sympathy.

what mods has it had done to get it to 346? know who did the mods? who mapped it?

As far as oil changes, every 3-5k depending on hows its driven, always put vpower in it. If it has a misfire or a fault code, dont try and drive through it, back off and get it checked out. Dropping a sensor can take out an engine if you dont.

 

The mods were done by TSL .
TSL tune
Upgraded turbo (although I'm not sure which one specifically)
Top mount STI intercooler
TSL 4 inch decat exhaust with N-sport back box
I assume the injectors have been upgraded as well, but not sure which type

 

were done a while back then.

 

It would seem so, I guess TSL hasn't been around for a while now. Everything seems to be running well though, and I have had no misfires or fault codes. It seems like it was well loved and well maintained by it's previous owner.

 

went **** up many years ago, at least 5 at a guess.