The K&N Pro Series East name was adopted in 2015 when K&N Engineering became the title sponsor of both the East and West regional divisions of NASCAR's Grand National-level racing. The series occupied the same territory and mission as its predecessors: short oval tracks between one-third and one mile in length, along with a small number of road courses of 1.53 and 2.45 miles, primarily in the northeastern and mid-Atlantic United States. The series also participated in combination race weekends held alongside the NASCAR Cup Series at selected venues.
The K&N Pro Series East used the same car package as its western counterpart. Vehicles ran a V8 pushrod engine displacing 358 cubic inches, producing approximately 650 horsepower without restrictor plates. The cars ran a 12:1 compression ratio and used a four-speed manual transmission, with a minimum weight of 3,300 pounds. From 2015 onward, a composite body developed by Five Star Race Car Bodies replaced the older steel bodies, reducing fabrication costs and introducing easily replaceable body panels. Teams could opt for a specification engine built from NASCAR-approved components or construct their own to team specifications.
In 2012, NASCAR unified the technical regulations between the K&N Pro Series Invitational, the North Series, and the East Series under a common rules package. A pre-season invitational event called the Toyota All-Star Race was added to pit the strongest drivers from the East and West against each other. In 2013, further rule changes gave teams the option of running composite bodies and specification engines to reduce the cost of competition.
The series drew drivers aiming for NASCAR's national touring series, with Chase Elliott winning the East championship in 2010 and 2011 before rising to the NASCAR Cup Series. Other drivers who passed through the series during its various name iterations include Martin Truex Jr., Joey Logano, Ricky Craven, Austin Dillon, Trevor Bayne, and Ricky Carmichael. The series also functioned as a training ground for crew chiefs and NASCAR officials.
In December 2019, NASCAR announced that Camping World would become the title sponsor of both the East and West divisions of its Grand National racing. The following year, in 2020, the series was incorporated into the ARCA Menards Series East following the merger of NASCAR's regional ladder and the Automobile Racing Club of America's series structure. The ARCA Menards Series East continues to operate over much of the same territory and with the same developmental purpose that the K&N Pro Series East had carried since 2015 and its predecessor series had established since 1987.
The NASCAR K&N Pro Series East represented the final iteration of NASCAR's long-standing northeastern regional championship before the ARCA merger restructured the landscape of American short-track racing. Its five-year lifespan under the K&N name capped more than three decades of developmental racing under various titles in the same geographic footprint, and its alumni record illustrates the role the series played as a genuine feeder into the higher tiers of stock car competition.