Best to have the engine out of the car.... you can feasibly do it while the engine is in the car but.... its a tight squeeze.... we did this on my engine before we put it in the car.
Im using an hks catted downpipe thay came with my front clip.
Or... you can run a standalone (vipec, hydra, AEM) and do some wiring for the exhaust avcs, that will work too.
some guy with a forester did this swap and used a hydra standalone ecu. It worked for that person but i dont think his gauge cluster works. You'd have to get a racepak or some kind of custom cluster.
Obviously, the standalone route is expensive. But you'd have working quad avcs.
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