Greetings all, my 98 forester had head gasket replaced at 150,000km. Now I am noticing a very pronounced engine growl between 2300 and 3000 rpm while driving or in park (157, 000km). Things I have tried after reading through the site are, fresh oil and new filter, removing various heatshields, checking muffler for pieces of catalytic, driving slower to reduce higher rpm's (very difficult). I did notice however that there was less engine growl when I took off from a traffic light while the car was on an incline. Not really sure where to go from here and looking for some advice. cheers.
Thanks for the responses but the noise problem is deeper into the engine bay and more pronounced on the passenger side. I hear a change of pitch from the engine above 2000 rpm. I thought maybe manifold bolts loose from the head gasket repair but bolts are tight. Any thoughts?