I've got a full SS system with lightweight BB and silenced center section on at the moment. Fitting the 100 cells makes it quite a bit louder. I think I personally prefered the sound with std cats, SS silenced center section and SS lightweight rear box.
Saving weight was my reason for changing from standard. When we took off the rear box Ant @ Simpsons stuck it on the scales. 25kgs!! Weight of the SS lightweight was 10kgs in the wrapping, so probably 9.8 really. That's 15kg + weight saved. I think with the 100 cell cats, center section and backbox it's saved 25kgs minimum.
I'll try and get a video of the car at my next trackday and post it.
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