2006 Forester XT
I have an 06 FXT MT, my first ever non-GM Holden car so everything is new to me. It has begun ruining my life/making a kind of chugging(?) sound when it reaches temp. Doesn't seem to affect performance (though i feel like something is as it feels very lacklustre) and gets faster with revs and then disappears at the shift into 2nd. Isn't at all metallic sounding, almost sounds like an exhaust leak but my mechanic said it probably isn't that after a brief listen and drive. Also seems to be coming from the passenger side (RHD, left side from drivers position, right side when looking at the engine, secondary airpump side) and is barely audible from outside the car yet quite loud from inside.