What else to replace "while its up"? M3 FCA, XTA, etc

[MT135]

My new-to-me 135i will be down for a few days getting a bunch of mods, among which are the following suspension parts:

M3 Front Control Arms
Whiteline 27mm sway bar and adjustable end links
ST XTA coilovers
Dinan 10mm rear shock tower bushing
Whiteline rear subframe bushings
M3 Diff bushing

Any other bushings I should replace while the car is getting work done?
2009, 38,500 mile, New York car, won't get it for a few weeks to check out what's going on. But the car is going from the truck to the lift.

[Solo_M_Tech]

Since they are working with the rear subframe, I'd install Stainless steel brake lines while you are in there. If you plan on doing that upgrade later down the road, I'd do it now so you don't have to drop the subframe again.

[swagon]

E46 tranny mounts maybe?

[AlexR6]

A bigger rear swaybar for sure... if you install only a bigger front swaybar you will increase understeer and vanish the beneficial effect of the FCA and coilovers

[dtla1]

Originally Posted by AlexR6

A bigger rear swaybar for sure... if you install only a bigger front swaybar you will increase understeer and vanish the beneficial effect of the FCA and coilovers

This last recommendation has a long history on 1addicts. It's been very contested on whether to add a larger rear sway bar without having an LSD.

[MT135]

Stainless steel brake lines are sitting next to all the other parts.

I have an LSD coming in the mail that a shop will install, I'll wait on rear sway bar until LSD goes in. That way I can get a feel for the current round of mods first.

Read the tranny bushing thread, E46 mounts seem like a happy balance.

I was asking more along the lines of maintenance items. Any other bushings or mounts to replace?

[AlexR6]

Originally Posted by dtla1

This last recommendation has a long history on 1addicts. It's been very contested on whether to add a larger rear sway bar without having an LSD.

If it's not a track-only car, then it' better upgrade both or keep them both stock IMHO.

[Black Prinz]

M3 Rear Arms & ECS Rear Bushing kit M spec

[MT135]

Originally Posted by Black Prinz

M3 Rear Arms & ECS Rear Bushing kit M spec

From what I've read about rear arms, there is little benefit to them?

[Black Prinz]

Originally Posted by MT135

From what I've read about rear arms, there is little benefit to them?

Perusing Fe1rx thread, he notes, "The ball joint used at the inboard location (of the M3 Guide Rod) effectively doubles the stiffness and halves the deflection under axial loading versus the OE Guide Rod, which will alter (and presumably decrease) compliance steer effects."

I doubt BMW AG beancounters would have let M division get away with the cost of a new parts if the part didn't have some difference/benefit.

For me I was at almost 100K miles so it seemed prudent to replace anyway; for you the mileage isn't high but "NY" car could mean NYC car and severe duty that such would imply or if not still potholes galore throughout the region.

[chris82]

Originally Posted by MT135

From what I've read about rear arms, there is little benefit to them?

There is always the benefit of lighter weight, but I don't think the benefit is worth it unless you are actually having trouble with your car as is.