I have had no problems with Optima and have been using them for a lot of years. I had a yellow top in an old Jeep XJ that went 7 years (in Phoenix heat) and was still good when I sold it. I have two red tops in my 06 now and they come with the adapters you'll need to install them in the trays, no modifications are necessary. Haven't had any issues with the "mexican" batteries. If you have the time, order them from summitracing.com as it will save you about $100 bucks over the local parts stores and last I checked shipping was free.