Is there a way to know for sure when your MDS comes on?

 

As far as indicators go, no. There's the ECO display but it simply means you are driving in a fuel efficient manner and may or may not be in 4 cylinder mode. V6 trucks have the ECO display as well.

 

You feel it, as a slight vibration, when you go to four cylinders. It just doesn't run as smoothly. Give it a little gas, and you can feel the smoothness, as the eight kick back in. It's almost seamless when it switches, but it can be felt.

 

watch your rpms it will drop about 3-400ish when it kicks in

 

Rpm drop? Read that before. I never see any RPM drop. I can feel and hear mine every second that it kicks in and out of MDS. But no rpm drop. Now when the torque converter locks or unlocks yes its a 300/400 maybe rpm up or down nut not MDS. When mine is in ECO its always in 4 banger mode.

 

With mine I cannot tell any difference with my 10', which is good I quess. It is seamless.

 

Mine was seamless until the Magnaflow muffler. Then once I got tuned into the exhasut sound I can tell when it is or isn't at any speed. I play with mine sometimes to see how slow I can hold it and how slow or fast and such.

 

mine will shift into overdrive, then it will drop rpm if conditions are right

 

only way i can tell, (barely) with my 09 is because i put a 14" magnaflow muffler on it. so its a little more pronounced when it drops down to 4...

 

Yea, there are alot of posts on after market exhausts and a noticible sound difference from 8 to 4. It is my understanding when in MDS mode they sound horrible, that is why I never upgraded.