I can't comment as of yet from first hand experience..... but I will have some freshened up 4.8is calipers and s/s lines mounted up in a couple weeks. The calipers are getting blasted and coated at the moment. Also of note, I am trying out ECS's sealed brass caliper guides. This gets rid of the rubber guides. The ECS caliper pins travel in a machined brass housing that has seals on either end. They are designed to create a much more precise, rigid braking movement. Less flex and more square. They claim to closely approximate the feel of a mono block multi-piston caliper, at least as closely as a floating caliper can. Here's a link for those intrested. https://www.ecstuning.com/b-ecs-part...003326ecs02~a/
I decided to do the retrofit as I have gathered that they are a nice upgrade. I know they are a heavier package, also adding weight to the undesirable side of the equation... un-sprung mass. But, for the money and ease of install I went this route. I wanted to upgrade to something, but still be able to run my 18" snows. There are a few upgrade options using OEM Brembo calipers from Land Rover Sports and the like. A quick search on here yields a few threads for a couple different retrofits, including direct bolt ons from the e70, e85 X5///M. Some of them require the use of 20" wheels permanently, which may be fine for many in the sunbelt.
I will see how my 3.0 feels with the extra mass as well as a considerable increase in braking performance. I am really going to need some braking performance........ more to come.
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2005 X5 3.0, 6MT, Alpine White on Truffle Brown, Sport, Preim, and Cold Weather, Alpina Stainless Headers, AFe Intake, UUC SSK, OEM 87's, 3.64 Differential Swap,Performance Modified Euro 2 Tune, UUC LTW Flywheel and HD clutch, Bilstein B12 Suspension kit 
Future mods ZHP/Schrick Cam Shaft upgrade, Operation code name: Doppelschrauben-Kompressor
Wife's Ride: 2011 e70 X5 351 M///Sport.
Also in the fold: 2004 X3 3.0, 6MT, Black Sapphire on Terracotta, port, Premium, Cold Weather.
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