I'm going to be building a 2.5l hybrid with 272 cams. Will a 2005 impreza wrx still 5 speed transmission fit up under my legacy?

If you're NOT adding a turbo or other FI (forced induction) your stock 5-speed is adequate, as it'll hold 250hp/torque as it did on my '98 Forester turbo project. But it depends on how you drive it.....even the WRX won't last if you're launching/clutch dumping it.

 

But if you go w/the WRX, yes it'll bolt up - you may need the rear diff, too as it's a 3.54 FD ratio...actually, it's a weird 1.1:1.

 

Subarus w/the 2.5 were 4.11; '96-'99. 2.2 were 3.9.

 

And I believe the WRX is a PULL type clutch and the '98 is a PUSH so you'll need the compatible clutch/FW/TO bearing, etc.

 

Not sure if the master/slave clutch cylinders will work.

 

You may also have issues w/the speedo - around '05 Subaru went away from the trans-mounted Speedo.

 

GL,

TD

Edited February 29, 201610 yr by wtdash