You cant get heads for our trucks we have electronics that plus into them and the aftermarket heads have no port for them,. Do what i did get the tfs 264/264 .550/.550 cams and spring and lifter kit from summitracing.com im currently getting my truck dyno'ed the guy said to expect 35-45 more hp id be happy with 20 more but we'll see. What also sucks is the only cai that will fit is an air raid and it only has the filter and box no tube. All i could find really was exhaust sct tuner and cams, should get me close to the 300hp mark but theres just not many options for us with the new 4.6 2v. Im planning on getting an On3performance turbo kit and trying to coherse a performance shop to intall it but that has yet become a reality.