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99 Ram Diesel...4 " exhaust (installed in Jan '06) lowered the EGTs significanlty, esp at high throttle settings. This translated to being better on hills. I watch my EGTs carefully and tend to be a little "softer" on the throttle than most, (old airplane habits)...not a hot-rodder, but I know the power is somewhat greater at almost any throttle position.
As far as MPG, I have noticed a slight improvement under normal cruise conditions....but that almost has to be, since the engine is working slightly more efficiently, slightly less throttle needed to maintain steady state cruise power at any specific speed.
Wish I could give you a firm # on the MPG, but not enough data yet for me to be sure, but it is looking like around .8 mpg improvement.
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