I recently got the Eurocode ARBs, end links, and diff mount inserts installed. The ARBs and end links are popular upgrades on the C7 platform so I won't spend much time offering feedback. Suffice it to say that this virtually a must-do mod on these cars! Like others have noted, this install cost should fall in the $200-$350 range at your local indy shop if you aren't doing it yourself. I will say the end links, while not cheap, really add to the overall improvement and benefit to this mod. I believe they are worth the extra cost, just my .02.
A trans mount insert upgrade, whether from 034 Motorsport (which I've done) or Eurocode is also a popular mod here. No question it firms up the driveline and makes shifting smoother, especially the 4-3 and 2-1 downshift in Dynamic Mode or paddle shifting. I saw that Eurocode also offers top/bottom diff mounts to compliment their trans mount. I decided to give them a try as well. They advertise it to minimize driveline slop caused by the torque of the motor deflecting the standard rubber mounts. This decreases the efficiency of the drivetrain's ability to put power to the ground. I'd say that the diff mounts perform as advertised. The driveline feels even more solid, shifting is crisper, and it does feel like the car is able to put the power down more efficiently. I'm very pleased with the trio of top diff mount, bottom diff mount, and trans mount. For a minimal cost, there's a lot of benefit. Again, just my .02.
The only other item to add would be the Alu Kreuz. I'd be interested in feedback from anyone who did the ARBs/End Links first and then added the AK on whether the AK made a big difference.
Shout out to Perception Motor Werks in Powhatan, VA for doing a great job on the install. They remarked how high-quality they thought the Eurocode products were, so I thought that was a good sign. They took some pics in case you're interested:
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