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Message: [QUOTE="IdahoF350, post: 413351, member: 2989"] The HPOP itself is fine, but '07s still had STC fittings that are leak prone and there are HPO stand pipe and dummy plug updates. The "scoop" in the up pipe is for the EGR system you said you plan on retaining, so you will want to address that. I heated mine to a nice bright orange with my oxy/acetylene torch and drove a big black impact socket through the pipe to remove the restriction from the scoop. It leaves a slot for exhaust gasses to pass through and does not pop a CEL or any EGR performance codes because the computer still sees positive pressure at the EGR valve. It does improve off idle spool and will reduce the passenger side EGTs a bit by letting the heat move along. Have you looked at the stock intake elbow? With it off? It's akin to two pipes welded together at a right angle on the small radius, there's an actual edge! You will see an increase in flow into the manifold from upgrading it, there is no way I would spend the money or invest my effort on a ported manifold and keep the stock elbow. The devil will be in the details to reach your goal. It's going to be the small things that add up to push you that little bit further towards your goal. As for testing, all you need is something that will log vehicle data and somewhere you can safely accelerate the truck for a dead stop to a set speed repeatedly. Log engine speed, vehicle speed, throttle position and you can do acceleration runs. You'll be able to measure time in milliseconds to go from a dead stop to a set speed - say 75mph - and as long as you always test at the same place, gains or losses will be visible in elapsed time. Same as a drag race, just not at a track. [/QUOTE]