I'm not really over concerned about the noise, I am more worried about longevity. It needs to go another 85,000 miles before I get rid of it, and I drive 550 miles a week.

I drive from an altitude of 3000feet to about 100 feet on my commute to work. I noticed that the injector knock is consideably less in the lower altitude. Just thought I'd mention that.

I'm not real sure Greg if I want to buy the necessary tools to remove the prechambers....they are fairly expensive if I remember correctly.

I checked with MB, I can get injectors for $41 ea, cheaper the performance products, they want $61.

So I guess I'll leave it at that for now.
Thanks Guys!