Hey guys... the OP's '08 CTS4 (has AWD) would be equipped with the FE2 suspension, not FE3. FE3 was not /is not available with AWD. I owned (leased) a fully equipped '08 CTS4 3.6 DI FE2 for over a year and a half, and to be honest I found that car to be quite rough riding - it didn't handle bumps in the road very well. There's a big difference in the feel of the suspension of my current '11 CTS4 FE2/FE5 (which is excellent) compared to the '08 CTS4 FE2 I had. I would suggest to the OP that he replace the vehicle's '08 struts with latest version/spec FE2 components, and also suggest replacing the tires (are they the Michelin all-seasons as per original application at factory?) with a set that is more compliant and could provide a more comfortable ride.
As info my FE2/FE5-equipped '11 CTS4 came from the factory with 19" Goodyear RS-A2 tires size P245/45R19, and feature a carbon fibre reinforced sidewall. The specialized Goodyears provide an excellent ride despite their lower profile (aspect ratio of 45 versus 50) compared to the 18" tires found in the standard FE2 package.
As info my FE2/FE5-equipped '11 CTS4 came from the factory with 19" Goodyear RS-A2 tires size P245/45R19, and feature a carbon fibre reinforced sidewall. The specialized Goodyears provide an excellent ride despite their lower profile (aspect ratio of 45 versus 50) compared to the 18" tires found in the standard FE2 package.
