i think the 12 bolt is a better setup for a street car. the 9" housing takes up alot of space under the car. my quick performance torque arm bracket hits the top of the trans tunnel when the suspension compresses. the moser 9" torque arm will hit the trans tunnel to but seems there theres more clearance and its a stronger/better design. but on the other hand 9" components are readily available, you can source good used parts for short money & its a stronger setup over all.
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1999 Z28 T-Top M6 - LS6, Bolt Ons, Suspension, MWC Narrowed 9" - 415rwhp 385rwtq 10.847 @ 125.17
1989 IROC-Z H/T M5
2006 F350 SCSB 4x4 6.0L Diesel - Studs, EGR Delete, Powermax Turbo, Extreme Tuning & Exhaust - 13.23 @ 101
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