I have a 09 MCS
i had a DOS intake, downpipe, and want to get a tune after the summer. I was just wondering how much my automatic mini can handle? can i reach 250 hp with it?

 

https://www.northamericanmotoring.co...nsmission.html

 

As the above was not much help, there are three main worries.
Clutches and bands will wear out. Flush every year, and you can probably keep them alive.
Mechanical strain. We will find out when some one breaks one. I would not guess they are over-rated by too much as that adds size, weight, and cost. Some are, some are not. Remember when Chrysler used the auto off a 1600 in the 3.5L minivans.
Lastly is matching the torque converter. This is more of a drive-ability issue, however some can't take the strain in how the fins are brazed.

I don't know the size of the transmission cooler. Usually would not hurt to increase it or add a temp gauge.

To your original question, yea, depending on how you drive it. If you hammer it around or drag it, or if you drive smoothly. That probably makes a lot more difference. How the ECuUmanages the engine makes a difference. I would not be scared at 250. 300 I would.

 

hmm thanks for that info. So if i were to hit 300, i should becareful for my clutch basically

 

To me, this is not about an absolute threshold which will be the breaking point for the transmission.

The more HP you put on, the greater the probability of failure.
The rougher you are, the greater the probability of failure.
The less you maintain, the greater the probability of failure.

Most parts do have a power tolerance built in.