Sorry about the late reply...

but if you still want a answer...

Before the fuel filter change when I tried to pass somebody, I would depress the gas pedal until I hit the kickdown switch and that car up shifted (to about 3500 to 4500 RPM) as the engine climbed to 5000 RPM, it would start to sort of max out, but was only a 5100 RPM...

the fuel filter change pretty much freed all that up... Engine sounds and feels and operates much more smoothly at higher RPMs...

There is also less delay at a stop light, I get a much more immediate response when I intially accelerate. (That may be due to the Lubro Moly fuel cleaner I put in though....)

__________________
2006 BMW M5 "Heidi" @ 109,000 miles
2005 MBZ C55 AMG "Lorelai" @ 165,000 miles
1991 MBZ 300E "Benzachino II" @ 165,000 miles
1990 MBZ 500SL "Shoshanna" @ 118,000 miles

(On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)