I have OBX long tubes on my 04, and ran the canned tunes before I got my custom ones. I would recommend getting custom tunes for the lt's. Before on the canned you could notice a little difference with the headers, but after getting my custom tunes the truck is an animal. To put it in perspective, I live in Iowa, and camp along the Mississippi river. I tow a 8000lb. camper up some pretty nasty grades. Before my custom tunes I almost had to floor it to crawl up some grades at 40 mph. After recieving my tunes, I barely even had half pedal in it and was walking up them at 65. So long story short, the headers are worth it if tuned for it.
By the way, the kit wasn't hard to do. No modification of any kind. Took around 12 hours and a 30 pack or two. Just my two cents.
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S&B C.A.I., OBX LT's, Magnaflow 3"-2.5" SIDO 14" Muffler, 3.5x18" tips, Gryphon CS with 89 tow and perf. and 93 perf. tunes
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