So I finally got some things done to the car.
First is the whole set of fuel pumps. I was having hiccup at high rpm when gas is low or driving inclined. I have not tested so far since fuel is still high but so far not much of a difference driving normally.

i also took the plunge and got koni yellow sport for regular C class on. The ride is a little softer on default settings and the impacts seems less noisy. I have the non pp version. Overall im really sastified with the ride with the konis. While fixing, noticed the sway bar bushing was torn as well as the end links. So got that replaced as well.

i also got the 17mm rear spring pad replaced since my driver side (Right) was about 10mm lower.

over all very happy with the updates.

One thing I noticed is the exhaust sounds deeper now. Is pretty obviously on idle when rev it up. Anyone got any idea?

need to depress the rod and adjust. Cant adjust from outside.