This is going to open a whole can of worms but I just finished making an air ram for my 300sd. I just finished it two days ago and I havent had time to drive it tons since I have done it but I can definatley say that this DID increase the performance in the 1000 to 2000 rpm range. I increased the diameter of the snorkel off the air box to a 4 inch tube. I will start a new thread on this as soon as I can get the pictures finished (hopefully tonight)
Eric Z