I'm keeping mine a 6, but am so glad I stiffened up the car just a skoash (both in general and in roll rate with the sway bar), as well as upgraded the front brakes to factory disc. stock, my .85" t-bars had a wheel rate of 100 lb/in, the new .92" ones are rated at 150. the rear 5 leaf springs were rated at 85 lb/in, the new 6 leaf 130 lb/in....