No. 20-1355 ___________________________

John Penrod; Gus Erpenbach; Juan Welsh, all individually and on behalf of themselves and all others similarly situated

lllllllllllllllllllllPlaintiffs - Appellants

v.

K&N Engineering, Inc.

lllllllllllllllllllllDefendant - Appellee ____________

Appeal from United States District Court for the District of Minnesota ____________

Submitted: March 17, 2021 Filed: September 15, 2021 ____________ Before SHEPHERD, ERICKSON, and KOBES, Circuit Judges. ____________ ERICKSON, Circuit Judge.

Plaintiffs are three individuals who purchased oil filters designed by defendant K&N Engineering, Inc. (“K&N”). They seek to represent a nationwide class of all purchasers of three styles of K&N oil filters that they allege share a com