J-W Performance [JWP]
http://www.racewithjw.com/
Performance racing transmissions and components

Jaz [JAZ]
http://www.jazproducts.com/
Racing seats and fuel cells

JE Pistons [JEP]
http://www.jepistons.com/
Racing pistons

Jerico [JER]
http://www.jericoperformance.com/
Performance transmissions

Jet Performance Products [JET]
http://www.jetchip.com/
Computer chips, modules and power filters

Joe Gibbs Performance [JGP]
http://www.joegibbsracingoil.com/
Performance Racing Lubricants

Joes Racing Products [JOE]
http://www.joesracing.com/
Aluminum racing products

Jones Racing Products [JRP]
http://www.jonesracingproducts.com/
Performance Pulleys and Belt Systems

JP Performance [JPP]
www.jp.com.au/Performance.html
Performance timing sets