When I got my new CV shafts, the reviews for the Advance shafts said not to get them cause of the three belows and bad fit. I replaced mine with autozone cheapies that had 5 belows and fit correctly.
I have both Oreilly ones now and my passenger side one has about 10k miles on it now and its good to go
http://www.grandprixforums.net/my-06-gp-gxp-72403.html OBX headers, TEP tranny cooler, ls1 IM fuel rails and injectors, ls2 TB, ls7 MAF, full custom exhaust, Quad retro headlights, full out front and rear suspension work, tuned by HPT by me 8====>