[IllSic_Design]

Hey, so I've looked through the tons of suspension/bushing upgrade threads and can't decipher exactly what I am wanting to know.

My rear end is at 195k, with the only thing being touched so far is the shocks/springs. This winter I want to do a complete refresh/upgrade of the rear bushings/control arms/etc.. I track the car a few times a year, hopefully a bunch more next year.

1st thing is bushings. I know I want to upgrade the subframe and diff bushings to the M3 version. Do I need everything in these kits or can some stuff be excluded? Do I need to add anything else?:
https://www.ecstuning.com/b-assemble...3326763092kt1/
https://www.ecstuning.com/b-genuine-...h/33312284019/ (x2)

2nd up is M series control arms:
I want to put whatever in that's going to need to be replaced/upgraded.
Are these M3 control arms needed/an improvement? I know there was a thread on the 1 series forums about the non-m arms being just as strong as the M series arms and no point in replacing;
https://www.ecstuning.com/b-trw-part...3322283547kt4/

3rd. Then there is the confusion of camber, trailing, and toe arms. Are any of these the same arm with a different name? What should be replaced and/or upgraded to improve handling?

Thanks for any and all help.

[VonBimmer]

Just subbed. I'm going through the same exercise. My 335 has 170k, rear shocks are blown, it's time to upgrade, but trying to find some definitive answers.

[thebax]

Originally Posted by IllSic_Design

Hey, so I've looked through the tons of suspension/bushing upgrade threads and can't decipher exactly what I am wanting to know.

My rear end is at 195k, with the only thing being touched so far is the shocks/springs. This winter I want to do a complete refresh/upgrade of the rear bushings/control arms/etc.. I track the car a few times a year, hopefully a bunch more next year.

1st thing is bushings. I know I want to upgrade the subframe and diff bushings to the M3 version. Do I need everything in these kits or can some stuff be excluded? Do I need to add anything else?:
https://www.ecstuning.com/b-assemble...3326763092kt1/
https://www.ecstuning.com/b-genuine-...h/33312284019/ (x2)

2nd up is M series control arms:
I want to put whatever in that's going to need to be replaced/upgraded.
Are these M3 control arms needed/an improvement? I know there was a thread on the 1 series forums about the non-m arms being just as strong as the M series arms and no point in replacing;
https://www.ecstuning.com/b-trw-part...3322283547kt4/

3rd. Then there is the confusion of camber, trailing, and toe arms. Are any of these the same arm with a different name? What should be replaced and/or upgraded to improve handling?

Thanks for any and all help.

2 and 3
M3 rear upper and lower arms are direct fit and do not require any modifications. Instead of buying genuine bmw arms you can buy TRW kit from FCP: https://www.fcpeuro.com/products/bmw...-e93-bmwmcaktr
or ECS: https://www.ecstuning.com/b-trw-part...3322283547kt4/
M3 toe arms won't fit non-M cars since the difference in length between subframe mounting point to spindle.
https://www.e90post.com/forums/showp...5&postcount=51

[IllSic_Design]

Thanks, although already installed all this over the holiday break from work.

Installed M3 rear control arms(TRW, upper/lower), Manzo toe arms, and all new subframe/dif bushings. Everything feels nice and tight back there now.

[mweisdorfer]

Originally Posted by VonBimmer

Just subbed. I'm going through the same exercise. My 335 has 170k, rear shocks are blown, it's time to upgrade, but trying to find some definitive answers.

Go with the B12 kit at FCP Euro and get a lifetime warranty

[IllSic_Design]

This thread was more for rear suspension arms, sub frame / diff bushings FYI