I just received a set of SW longtubes for my L76 and this will be my first set of LT headers. I just had a couple of questions for the guys on here running these. These are the ones that have the new design longer collector (2.5inch) with the merge spike, are you pleased with the performance gained and any real world results like dyno numbers or e.t. improvements. I know there have been hundreds of header threads but none with these particular ones with the 2.5 collector on a 6.0. I chose them because I thought I might get a little better throttle response and bottom end torque with smaller collector and pick up some HP with these 1 3/4 primaries. Hopefully I will, also I will be running 2.5 duals, x pipe, 18 inch magnaflows all the way out under the rear bumper, this already is on the truck less the headers. Thanks for any input!