I have a 93 300sd w140 .110,000 mi ,On the clock, with every ones favorite motor the 603.971 it runs pretty good for such a heavy car, I was wondering what I could do to give it a little more power and increase the longevity? I am really use to the 617 on my 85 SD witch a had running so sweet! Can I disconnect the egr without any lights coming on ?? or can I boost up the turbo a couple of psi? Or do I run the risk of the ultimate 603 Death? and should leave it alone ?
Thanks, J