Thanks man I'm glad you liked it! I think this weekend I'm going to attempt to do a DIY on tinting your lights. I know there is already a DIY for that on here somewhere, but I figured, "Hell...if I'm gonna do the project anyway, I might as well take some pics while I do it."
I don't see why it wouldn't work for a diesel but you should probably ask someone more experienced with them, as I am not. As per to the sound, yes, there is a TREMENDOUS sound difference. At around 2.5k RPM's you hear a very deep rumble. I don't have a sound file but I can try and get one posted. You don't get the air sucking sound you would from a CAI but you do get a nice deep rumble that sounds pretty badass if I do say so myself.
Putting a big hole like that will not give you any sound difference, plus it opens it up for nasty things to get it. The holes allow you to get resonance on the side and I SWEAR you WILL hear a difference, especially from 2.5k RPM's and up; I even here a nice, "VRMM" when I start my car.
I recommend you stick with the holes. If you follow my DIY, I havent changed it at all and it sounds wonderful. =)
dude, i have a 2002 gls with no turbo, and its automatic with 108k miles on it. I was thinking about an ecu, short ram, and a catback exhaust. i found a PCD performance chip for $80, but people are telling me ECU's cost $300, whats the deal? am i missing something?