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  1. #1
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    M3 Rear Control Arm Upgrade Question

    I have the front m3 control arm, was wondering if the rears were worth it? Or should I look into rear subframe bushings instead?

  2. #2
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    2 out of 2 members liked this post. Yes Reputation No
    Worth it would really depend on your goals. To run the full M3 rear, you also need to run M3 rear struts. Companies like KW will give you a kit consisting of e9x non-M fronts and e9x M rears too. Personally, if you've already invested in good coilovers, and aren't tracking your car constantly and looking to shave off 10ths of a second, I wouldn't bother. If you're about to pull the trigger on suspension bits and have the cash, I'd say why not.

    Just for reference, though, my car is on rails and I've never had a better handling car. Including my e46 M3. Here's my setup if you're interested.

    M3 everything, front and rear, minus the rear control arms
    KW Clubsports
    wavetrac LSD
    every bushing made by powerflex
    cobb sway bars
    bimmerworld adjustable endlinks
    akg lower RSMs
    e46 M3 trans mounts
    335is motor mounts
    245f and 275r Falken rt615k
    -2.5* front camber and -1.5 rear.

  3. #3
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    1 out of 1 members liked this post. Yes Reputation No
    Click here to enlarge Originally Posted by berns Click here to enlarge
    Worth it would really depend on your goals. To run the full M3 rear, you also need to run M3 rear struts. Companies like KW will give you a kit consisting of e9x non-M fronts and e9x M rears too. Personally, if you've already invested in good coilovers, and aren't tracking your car constantly and looking to shave off 10ths of a second, I wouldn't bother. If you're about to pull the trigger on suspension bits and have the cash, I'd say why not.

    Just for reference, though, my car is on rails and I've never had a better handling car. Including my e46 M3. Here's my setup if you're interested.

    M3 everything, front and rear, minus the rear control arms
    KW Clubsports
    wavetrac LSD
    every bushing made by powerflex
    cobb sway bars
    bimmerworld adjustable endlinks
    akg lower RSMs
    e46 M3 trans mounts
    335is motor mounts
    245f and 275r Falken rt615k
    -2.5* front camber and -1.5 rear.
    Thanks for your setup! Got something to compare to now. I was actually thinking of the guide links and wishbones because like you said I don't want to run M3 struts since I already have KW v1s.

  4. #4
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    Click here to enlarge Originally Posted by krazi3azn Click here to enlarge
    I have the front m3 control arm, was wondering if the rears were worth it? Or should I look into rear subframe bushings instead?
    Chassis weakness priority list I would rate addressing subframe bushings ahead of rear arms.
    BMW ISETTA 300
    -LED interior kit
    -Carbon fiber key overlay
    PLANNED MODS
    -Wheel spacers
    -Secondary battery for LED kit issue

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