I have the Exotek chassis with there saddle pack brackets. I was doing some test yesterday, I installed Mantis 2 stage pistons, which work awesome. The chassis is well balanced with the batteries upfront the truck felt stable. I thought of drilling the chassis and putting the B44.1 brackets, I had them on my original chassis, but after thinking it through the chassis is too expensive to swiss cheese it. Plus the brackets from Exotek are pretty cheap.