1st Gen rear suspension question!

[gearhead1186]

I was planning on getting the tri 4 bar rear clip but now that you guys are doing this I will def wait. Lateral Dynamics already offers a 3 link that requires alot of work. I think if you make a 3 link that requires some modification, but lets you retain the rear seat while only sacrifing the performancte that wuld be noticed on an all out track car you would have a winner. I think I talk for alot of the people here as I think the majority of cars are street/strip cars and we can sacrifice a tad of performance for ease of installation. How much performance will be sacrificed for both systems, tri 4 bar and 3 link?