by that do you mean the progressive rate of the springs?

all european cars have a "harder" spring rate than US ones due to you having bigger better roads than us.
england is one little pothole, i go through tyres 0n my subaru every 2 months.

JDM springs are different to US domestic. (for the same reasons as the emissions/gas (ron) is different
our cars here need 99 ron (its called "super unleaded" here) + on my subaru i need to add millers octane booster to take it to 102 ron
US specced cars here have to be converted,