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You did a good choice by selecting the 3.46 ratio. I did the same and went with a Quaife in March 2014 before MFactory had these units for our manual 135i's. I bought a used MY2007 3.46 ratio large pumpkin with bolted ring gear for $500USD, and Quaife + installation for another $1800USD. I sold my 2011 OEM pumpkin for $500CAD...
The 3.08 to 3.46 ratio upgrade really makes the car ready to pounce in any gear. This was a great upgrade for the track and even for the street. The DSC and e-diff wizardy (ie: rear brakes) hardly intervenes anymore, and the car is much more predictable at turn out and flat out acceleration. I actually turn everything off (DSC OFF mode) at the track now, but only once the tires are warm because I now have full confidence in the car. The present alignment on my 135i is also exactly where I want it. No more understeer, and a very faint controllable oversteer when the car is pushed really hard.
Alignment specs are 0 toe and -3.2*camber in the front, 3/32" toe in with -2* camber in the rear.
I may eventually get rear toe adjustable arms for easier camber and toe adjustments.
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2011 X3 35i with M pack + 2011 135i w/6SPMT | 255 square tire setup | Quaife 3.46 LSD | Diff lock down bracket | Bilstein B8+Swift SpecR springs+H&R FSB | CDV delete | BMS Oil Tstat bypass | ER FMIC & CP | N54Tuning DP | GC Street Camber Plates | M3 FCA +guide rods+RSFB's+Tranny mounts | Manzo toe arms | Cobb Stg2 agressive tune | Hawk DTC70 brake pads | RB SS brake pistons | Goodridge SS brake lines | Custom brake cooling ducts
Last edited by dcaron9999; 08-14-2014 at 05:08 PM..
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