How much tire clearance does this add?

The flares extend the fender opening to accommodate wider or lower-offset wheels. Measure your current tire sidewall distance to the fender, then compare it to your target wheel and tire package. The flare volume is fixed — your fitment depends on your specific wheel size and offset choice.

Do these require drilling into the fender?

Installation specifics depend on your mounting approach and whether you're using the complete CCG kit (which is required). Before starting, verify mounting point locations on your vehicle's existing fender structure and plan your fastener strategy accordingly.

Can I use these flares with stock wheel sizes, or do I need wider wheels?

Fender flares are built to accommodate aftermarket wheel packages — wider, lower-offset, or both. You can run stock wheels, but the flares will extend beyond your tire profile, creating visual overhang. For the intended CCG wide body look, plan on upgrading to a compatible wheel and tire combination that fills the opening.