down tubes

  1. E9Wayne

    B35 exhaust manifolds or headers for high compression B34

    My recently completed B34 piano piston motor upgrade coupled with motronic 1.3 and L-jet intake manifolding has gone well overall. With a Dinan chip installed (from a 1989 USA 635CSi) she should be putting out about 240 hp but I'm convinced the stock M30 exhaust system is really holding things...
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