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Originally Posted by sillydriver
I own an 04 SL600 and love it, although I wouldn’t as much had I not spent $6k on Renntech’s engine and transmission software upgrade. In stock form the car has kind of a strange mushy throttle response at lower speeds. I had previously owned an 03 SL55 for about 9 months, but sold it back to the dealer because of reliability problems. With the modifications, I definitely prefer the 600 to the 55, although I miss the 55’s the engine noise.
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The slower response at lower speeds on the SL600 is exactly how the car is intented to perform. Both the SL600 and SL55 both go from 0-60 in 4.5 seconds except that the SL55 has all its power immediatley off the line and the SL600 picks up all its power at 1800 RPM's.
The SL55 suspension is a tighter suspension than the SL600 so you will not get as smooth ride.
When you add the Renntech to the SL600, you get the smoother ride from the suspension but it juices up the engine to act more like the SL55 and it is fast. Incredibly fast.
So...its a matter of preference and money.