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2006 Impreza WRX with PPP Manual of course! ;-)
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I think I'm right in saying that a late 01 will have 177ch instead of 170ch in the earlier versions. There are other differences in the exhaust system too, to fit in with emissions regulations (it resembles the 01 WRX exhaust with a resonator and no center cat, the cat is in a separate section just in front).

HTH

Simon
 
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