The deeper spoiler on the R certainly will help front end stability - when I got mine up to 130 there was no apparent weave or lightness, but of course I had the strut brace as well, which might have helped.
It will not be cheap, however - but if you want durability at speed, I'd definitely go for the best quality you can afford and fit it securely.
Remember to get your tyre pressures and tracking properly set if you're in the habit of going fast - it'll preserve your expensive rubber as well as being safer.
It will not be cheap, however - but if you want durability at speed, I'd definitely go for the best quality you can afford and fit it securely.
Remember to get your tyre pressures and tracking properly set if you're in the habit of going fast - it'll preserve your expensive rubber as well as being safer.