The 4th Gen's are a bit different if you want to do it as a hardware mod. Many members have done it, so the instructions are posted.
If you have DRL's from the factory, they can be turned off through the computer by a dealer. Here's the TSB that J.A. mentioned, EL014-06.
Expect the dealer to charge some insane amount of labor for this process - even though it's a 15-minute task that's done with a computer, their time is money. However, a lot of dealers would do it for free if you're going there to have other work done at the same time.