I have an old SMC kit that I have had for years and works perfect I run about 20-22 lbs on the street with no problems so my question is, Would going to Razors kit offer that much more than I already have to make it worth $530 for me? I mean as far as I can tell i could run a little more boost and a little safer but is that a big enough difference to change? Also what is the SMC kit worth used? Its the round bottle version. TIA