M42club.com - Home of the BMW E30/E36 318i/iS
DISCUSSION => Engine + Driveline => Topic started by: gunsmoke on June 02, 2008, 04:20:44 PM
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I know there are a lot of threads discussing this, but what size really is best for a stock M42? 2.5 inch? 2.25 inch? does anyone know what size the Supersprint system is?