I'm talking about all suspension on all cars. Your buddy probably has shock/struts that can handle the extra spring rates the S.Techs run. Bouncy cars are that way because the damper (shock/strut) can not stop the spring from bouncing (simple physics). Most any damper can handle +/-10% change in sprig rate with out too many adverse effects (which can include, but are not limited to: early failure, bounciness, harshness, wheel hop).
Tein, Bilstein, Koni, Tokico, KYB and any other shock manufacturer will tell you to have your dampers revalved if you are exceeding the +/-10% rule.
Spring rates specific to the tC:
Spring: F/R in lbs/in:% change from stock
Stock: 146/257
H.Techs: 185/308: +27%/+20%
S.Techs: 202/336: +38%/+31%
So, even by most standards the H.Techs should get better dampers, but the ride quality concerns are minimal in daily driving situations, but pre-mature shock failure will be a factor eventually.
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