Originally Posted by StewManChew

I just installed. Disconnected the negative battery terminal. Lost my radio station presets ....

I also lost the the power window programming. Windows on both doors were not resealing up after opening and closing the door. I had to go to dealer and get the program reset.... This may happen to you beware. Good luck.

Still observing the changes from the Typhoons. Now about 200 miles since install. Seems more powerful above 4000 rpm. May have also a slight bump open highway mileage while cruising. Well worth the $$$. Looks good in the engine compartement too...