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12b.3 Should I cut my bumpstops if I lower my car?

Bumpstops are cheap but effective way of halting suspension travel.
Bumpstops sit on the strut/shock shaft and prohibit the spring from fully
compressing the strut/shock. Thereby limiting the amount of suspension
travel.

When you lower your car, you decrease the distance of suspension
travel (because your car's suspension is partially compressed)
What some spring manufacturer's recommend is to cut the bumpstop
to lengthen your travel. This can have some possible negative
effects (like arranging a blind date between your upper A-arm and your
engine bay)

Follow the spring manufacturer's tech advice. Most recommend trimming the
bumpstop. This helps provide more suspension travel especially
for lowered cars.

FWIW, all lowering springs should increase the spring rate in the correct
proportion to the amount of lowering. What this means is, the spring
should be stiffer to make up for the lessened suspension travel distance.
You shouldn't need to cut your bumpstops if your spring has been engineered
right in the first place! What this also means is this, do not expect a
OEM ride with stiffer springs! You wanna go low, pay for it with ride quality.

Some of these "performance" springs are really springs just to lower your car;
and trimming the bumpstop keeps you from bottoming the suspension out which in
turn gives an illusion of a halfway decent ride quality. And if you're bottoming
out, well the companies figure half of these young Honda owners don't even know
what it is anyhow.