I went catless (PDE up-pipe, Invidia DP/Mid-Pipe, OEM muffler) and now the car makes a "whir" sound much like VW bug makes, between 2000 - 3500 RPM, under all load conditions. Is this right? Could a leak be causing this noise? I hate getting on the gas and sounding like a suped up bug from the
70's. Perhaps I should have left one cat in....Mike
Most likely you're hearing more of what was already there, now that your cats are gone... can't absolutely say that (from here!), you might have a leak, that's not uncommon, but you will absolutely hear more turbine noise.
I have read posts on some WRX boards that after installing an up-pipe they describe sounding like a VW bug as well. Maybe the cats muffle that sound some.
Believe it or not, Porsche and Subaru are not the only makers that use a boxer layout ;-)
An exhaust leak usually makes a whistling noise. Whirring noises are likely the normal engine noises that you hear now that you have no cats.
To check for an exhaust leak pop the hood and have someone rev the motor for you. You should get whistling and an exhaust smell.
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