I agree with Doug. I've tweaked my stock chassis' (04) and never had the problem with the BMI, yet I still need to get one for my 05. It's a great investment. Jason's chassis are laid in 0-45-90 degrees. Stock is only 0-90. All corners come routed at 45 degrees and the batt. holes don't need filing. A varity of colors, including matte black. Lighter than stock. Just glue your egdes and your done.
If you want to go lighter and tricker, check out ewippler's (AKA Erik) carbon upright posts with anodized thread inserts. Here's his thread. A+ service too.
Carbon Fiber Shafts for Touring cars
And I'm with everyone on the Tamale scene. Strongest alum. in the industry. Xray alum. is butter compared to Tamales. Never need replacing.
I'm happy with Xray and there innovations, and if I wasn't into mods I could care less about buying aftermarket stuff. But all the above step up the quality and trick factor a knotch.