Rear sub-frame bushings on an NA 128?

[KGrGunMan]

Do I really need to upgrade my rear sub-frame bushings with a low HP high grip 1 series?
Everything I've read makes it sound like the rear sub-frame bushings are more important as power increases.

I recently purchased a manual 2011 128i M-sport.
I'm planning on installing a set of Bilstein B16's, M3 front control arms, M3 rear upper link arm and guide rod.

After that, I'm going for the widest and stickiest rubber I can fit, but I'm not planning on increasing my 128's power, atleast nothing more than an intake manifold and a tune.

The car will see 8-10 track days per year while being a weekend street car.

With nearly stock power but more lateral grip, is there a performance benefit to upgrading the rear sub-frame bushings?

If the bushings are beneficial even for low power cars, are the Turner Solid Aluminum bushings livable or should I go with something like the group-N bushings or even stock M3 bushings?

I'm fine with a stiff connected ride, but I'd like my passengers to not complain too much and If it's unnecessary then I'd much prefer to save the money.

I appreciate the advice.

[dbronnik]

I'd do it on a stock power 128i for sure. There's no increase in NVH for your passengers

[asbrr]

+1.

It's not so much about the power, it's just about having a planted and predictable rear end on the car.

[desertman123]

Go with Whiteline. Either the inserts or the full 2-piece replacements are great for the price and ease of install.

[John_01]

Definitely not a good idea to keep stock subframe bushings for track use. The car will feel a lot more precise to drive after the upgrade, even for daily use.

[KGrGunMan]

Thank you all. The bushings are on order.

[asbrr]

Originally Posted by KGrGunMan

Thank you all. The bushings are on order.

Good man...which ones did you get? My recommendation like some of the others above is to get a 2 piece full bushing (Whiteline is one example). Easier to install, and no NVH downside.

[KGrGunMan]

I went with the group N race rubber bushings. I'm having someone else install them.

[asbrr]

Originally Posted by KGrGunMan

I went with the group N race rubber bushings. I'm having someone else install them.

Interesting - when I was doing research on which RSFBs to buy, these didn't really come up much, I guess the price puts most people off. Curious to hear your feedback after, and if you know how much stiffer than M3/1M parts they are?

[tsk94]

Theres no advantage to the Group N bushings. Solid bushing are cheaper and deliver more performance.

On topic, doing these bushing even on a 128i make a huge difference in securing the rear end on the car. I'd strongly recommend it as there are really no downsides (other then the work).