I dunno, I had AWR endlinks and the Progress rear swaybar and I couldn't keep it quiet. I did everything you were supposed to: used ramps to lift the rear so the suspension was still compressed, adjusted the endlinks so the bar ends were as close to horizontal as possible, I made sure the endlinks didn't bind when I inserted the bolt and I tightened the hell out of them! They would be quiet for about a day or two and then would get noisy no matter how much torque I applied to the bolts/nuts.He shouldn't be too bad if he's listened to what we've told him a hundred times. I have AWRs and they're silent.
Are the stock MSP struts Tokico's?