I can tell you guys, from a vehicle standpoint, my wife has a 2001 Toyota Celica GTS. This car is a 6-speed manuel with 200hp on a 4cyl. It came from the FACTORY with the NGK Iridiams. When I did her last tune up. I thought, " I am not paying that for plugs". Boy was I wrong. I put in a cheaper brand of plug and the car ran like hell, bad gas milage, missing, and everything else you can think of. I went and bought some new NGK and then car was like brand new. Those are probably some of the best plugs made in my opinion. I now have them in my Chevrolet as well. Plus, after seeing this, I am going to get some for my 800.
2005 Sportsman 800 Black and Silver,
Uni Air Filter, Spider Grips, Polaris Handgaurds, Quadovator 3-HL mod, Kolpin Jr. Fuel Pack, Front and Rear Stickstoppers, Bodygaurd Front & Rear racks, Bodygaurd Rear Brushgaurd, L&R Cargo Box w/ Backrest & cargo bags, Front Warn 2.5Ci Winch and rear Warn 2.5Ci Winch on custom mount plate, custom rear hitch w/ 12v outlet.(Elkbow Edition)
2006 GMC Yukon, DVD, Touch Screen Navigation, BOSE & XM radio, Leather, 3rd row seating, 285/70R17 (32x11.50) BFG All-Terrains, 15% Formaula-One Pinnacle Window Tinting