I bought the same ones as well. It's definitely the real deal. Very nice and good seller. The welding is pretty much just making sure you pay close attention to what they are doing while they weld it. They are going to have to cut your pipes too. So make sure they "measure twice, and cut once" type thing. You want it sticking out to your liking and a distance from the bumper surroundings. 2 fingers I guess? My shop did a pretty good job, but a bit less room at the top of the tips (just for cleaning etc) than i would have wanted.

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2005 LeMans Blue e53 4.8is
MODs
///LeMans Blue RBs///Intravee II///Sirius///ACS Spoiler///AiB v3///HID Fogs///LED Tails///
///215 20" Ferric Gray///MTEC Pedals///DVD Headrests///SMG M Wheel///AFE CAI Stage 2