Long tubes are WELL worth it. PITA to install yerself unless you have access to a lift. The Ford dealer I deal with even warrantied an O2 sensor after i had the long tubes in. No problem so far with bolts coming out yet, there are studs on my heads. Mac LT's=best bang for the buck. BBK LT's=pretttier and pricier (cant see em much under the hood anyway) Sean Hyland ceramic LT's= great if you have a big pile of money that is just sitting there under the money tree in your backyard. I don't have any dyno numbers for you cuz im waiting until im done with my motor mods. I got the Mac's with the matching O/R H-pipe with Dynomax Race Magnums. A very LOUD combo, though quiet at idle. Just my 2 centz.......
Gary
Gary