Hi again. I'm shopping around, looking for parts for my newly purchased 2004 WRX. Engine wise it currently has a K&N drop in filter and some axleback muffler. That's it.
Now this is my dedicated winter car (I drive a fairly extensively modified NSRT-4 in the summer) so I would like to (at least try ) to keep it mostly stock. And after some research I realize that because of the MAF and the way the open loop is triggered, this WRX is much more finicky with bolt ones then the SRT ever was. That being said, I would like to not require a tune, despite the mods I would like to do to it (tell me if it's feasible).
1st thing, this car is great fun to drive. I finally have traction! My SRT will roast 3rd on the street. While it’s great with slicks on the track, it can get old driving daily. That’s why I got the WRX. The launch capabilities off the line is superb and I love it driving around town. However, while the drivetrain begs for low end torque, the turbo however, makes itself wait. I have noting till the 4k mark. This is, in my opinion, way too slow, especially for a TD-04. So I would like to improve spool, hopefully without requiring a tune. Here’s my 3 step plan:
-Gutted stock up-pipe (already sourced a local spare)
-Samco scilicone Y-pipe kit
-Manifold heat wrap (What brand?)
From what I understand, all 3 of these will improve spool up time to various degrees. So a couple of questions remain. Can I go ahead with these 3 things and not require a tune (by require I mean, it will lean out otherwise)? You you guys recommend using the Grimmspeed gasket even with a stock uppipe? Also, is heat wrap a decent replacement for the stock heat shields (will it prevent the plastic from melting)? Because the bolts on mine will probably have to be destroyed and I’m not sure if I want to deal with them again.