Here is some info on suspension for Corrados. It was refering to someone who said Eibach sells the same spring for the 4 as the 6.

***Quote from Roland at H&R/Neuspeed****

Springs are the workhorse of the suspension system. The springs support the weight of the chassis, including the passengers and load. The springs function as a cushion over irregular road surfaces. They also help control body roll, brake dive and rear squatting on acceleration. Spring rates, or spring stiffness, greatly influence the handling characteristics of the chassis.
There are as many different ways to do suspension spring Research & Development as there are companies offering springs. Most spring companies are not able to even do R & D because they do not have the ability or knowledge to produce a spring design. These spring companies product designs are basically stock spring with a shortened ride height, or poor copies of some other spring brand. While other spring manufacturers try to use one spring design for as many different fitments as possibly. This cuts down on part numbers, reduces stock in warehouse and in turn cuts down on overhead costs.
The only other reason other spring brands can sell there inefficient springs is because of the foamy bump stop used in modern automotive suspensions supports there soft low springs. This foamy bump stop acts like a spring and is actually doing part of the spring work, the German spring industry even calls it a spring - Gummi Hohle Feder - or gummi spring. There are several reasons car manufactures use this long foamy bump cushion. Some of these reasons are that they make the suspension progressive, that is, as the suspension compresses the bump stop compress and builds up resistance, just like a progressive spring. This gives a nice cushy ride and never has that hard "I am hitting the bump stop feeling". The fomay bump stop also allows car manufacteres to use a simple linear spring design with a thin wire diameter. This saves weight and most importantly manufacturing costs. This type of suspension set up may be good for satisfying the average driving publuic, but does nothing for performance driving. A soft lowering spring when used with a big foamy bump stop, will result in a spongy, bouncy ride. This happens because the bump stop is doing the work and not the spring. The rebound value of the compressed bump stop is different from a precisely designed progressive spring. The bouncy rebound of the foamy bump stop also causes shock absorbers to wear out quicker. When tuning suspensions the right way the bump stop used for its indented purpose, to keep the suspension from touching metal to metal in extreme compression situations. When the springs are engineered correctly the suspension should rarely go to full bump stop and the springs should be doing their job. On the Corrado VR6 Neuspeed shortens the front bump stop and offers a progressive spring which is working at a precisely calculated rate. This set up gives a more predictable performance suspension that the shocks are able to dampen without bouncing.
At Neuspeed, design starts with an understanding of the automotive enthusiast's needs. These needs are considered by neuspeed engineers and are integrated into each design. Key elements involved in development include ride height and spring rate, which are dictated by the handling characteristics of the stock chassis, stock suspension limitations, tire and fender well clearance. Neuspeed engineers have a combined total of over 90 years of suspension tuning experience. Neuspeed knows Volkswagens!

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