DJ, I would suggest that every top prepped car has to change rear end gear rations to be competitive on the various tracks we run in the SEDiv. We all have to do it, why not BMWs??

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Yep....I'm not even in the "top prepped class" ....just in the WOMCAWC. work on my car all weekend class...
Multiple diffs as should all have

3.36 welded...Lowes
3.7 Quaife...VIR, Roebling
3.9 Disc......Road Atlanta
4.3 Quaife...Kershaw..CMP

But seriously....If in fact these cars "E-36" have been rendered impotent w/the SIRs...I to will cry foul.

Course it'll take a few laps on the track to believe this impotent claim.

David Spillman