I just swapped out my factory rear 22mm bar for the factory sport 23.5mm bar and put PowerFlex poly bushings on the rear bar as well as the front bar.

http://www.xoutpost.com/members/semc...ly-bushing.jpg

Very nice improvement in roll control for my tastes and not a budget buster for me. Got the 23.5mm rear bar off ebay for $100


Mike

For others the links show the set fits 2000-2006.

Yeah lots on eBay. So I just bought one there with bushings and getting it shipped, instead of me going to a picker at the moment where its -22° C (aka -7.6° F) and taking one off.

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e53 sway bar installation
 

So I did a full rebuild and dropped the sub frame and motor assembly and my dumbass mounted the sway bar under the frame instead of over it... i took it off 7 month ago and didnt put the under carriage plate back on, if I did I would have noticed but wanted to leave it off and check for leaks and all.. Anyways, all videos and forums are about sway bar end links... beside this post with the dropping the subframe option Pelican and Bentley manual didnt indicate dropping the frame..no offence I was not looking forward to that :( They suggested removing the front left control arm..well that does't work either. I had to also disconnect the trust arm at the knuckle to clear the axls but it fit like a glove and was easy...

Just another option if you dont have a lift or engine hoist or support beam. Just need a $20 ball join popper..

That s all folks :-)

Sway bar difference
 

Tested the 4.6IS without the sway bar and my first thought was cant wait to put this back on LOL. Dips in corners as expected, I m not sure what the stock thickness is on the 4.6is but it s there for a reason :-) 4.8is has front air suspension 4.6is doesnt, only rear not sure how that plays into it..

Oh no, should have known about this when I did a complete suspension overhaul front and rear. Would have been the ideal time to do this. Bloody heck!

Are there any aftermarket sway bar alternatives nowadays for the E53?

Ultra Racing makes some chassis stiffening products. Not sure they have any lower sway bars anymore. They do have stiffening bars and strut mount bar though.


https://www.ebay.com/sch/i.html?_fro...LH_TitleDesc=0

If you can find a set of Eibach sway bars they are well worth the investment.

FYI-I didn't get to what I wanted until I had installed the Eibach front and rear sway bars, Dinan strut tower brace and camber plates coupled with H&R lowering kit,wheel spacers and Bilstein struts. Prior to the upgrade I did a compete refresh of both the front and rear suspension including Powerflex subframe bushing.

I didn't go further since handling is already better than I should ever need on the street. The result is a very significant reduction in understeer. Only times I have experienced understeer is when I have tried to do something stupid.