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Different sizes to the exhaust wheel housing ( the casing around the wheel where the exhaust gasses go to drive the compressor wheel ) - affects gas flow speed and so spool up / ultimate power ... I think! Bigger gives more power when fitted to suitable engine etc., smaller housing gives less total / top end power but maybe better spool up .
John etc. will correct me if I got this wrong!
Last edited by vulnax999; Nov 9, 2004 at 09:52 PM.
