Hooker makes good headers, just a little expensive for the pocket. Pacesetter is a good brand at a good price. Thorleys, Dougs, and Dynamax are also nice, but their all expensive. Anyway this dyno was with a 5.0 with cams, heads, and much more not stock. But imho long tubes are noticable over shorties.//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif But I guess it's up how much you been around racing and the driver. I could notice a difference with a change in brand of oil and airfilter. //content.invisioncic.com/y282845/emoticons/yumyum.gif.0556df42231b304b9c995aefd13928a8.gif