Hey there, I just bought a 2004 WRX. It's mostly stock with a K&N drop in filter and an axle back exhaust. The one thing I would like to tackle ASAP is the up-pipe. I'm still completely baffled that Subaru somehow went through with putting a cat there but that's beside the point.
Considering I plan on keeping the car 'stock', I think the best for me is just to gut the stocker. From the research I did, I think the only down side (vs aftermarket) is some people noticing wastegate flutter (anyone else noticed this?).
Now, when it comes to actually doing it, I'm not afraid of the steps themselves. I have a shop with a lift and all the tools needed (except maybe a flex head 14mm and O2 sensor socket). What makes me pucker though, is 10 years of Canadian winters and their effect on bolts and nuts. I got the car on the lift and took a look at the bottom heat shield and the nuts on them look more solidly welded then the chassis itself. Knowing that, and from past experience, what I don't what to happen is to have a paperweight car just because I snapped a couple of studs.
So could someone share a list of P/N of studs/bolts/nuts that I better stock up before going through with this endeavor? Just so I'm not stuck with my only mode of transportation up on the lift?