A lot of the bolt on strut braces won't do a proper job, they're just soft and generic, have seen quite a few bolted onto S2's just with self-tappers

I had proper front and rear strut braces on my last S2 and it definitely made a difference. Only the front end was polybushed so when the rear brace went on felt like I was running 10j rears

I'd want things like polybushes, adjustable TCA's, ARB etc sorted first though tbh.