I have had my motor in and out several times since going to TTI headers but I have never taken the motor out with them attached. The passenger side is pretty easy to remove from the bottom but I have left the drivers side in the chassis until the motor is out . I leave the trans in the car and don't take the trans and motor out together , I would think it would be really tight trying to take both out with the headers attached. Just a little tip : when putting the drivers side header in from the bottom if you raise the motor up high enough you can manage to squeeze the header in without taking the suspension apart like they state in the instructions. I am really not that happy with the TTI headers especially in a race car , the header brand I use to use no longer fit properly ( hang to low ) as I purchased a new set to replace the TTIs . I don't like how the TTIs fit to close to the trans , they are heavy , the holes on the flange that bolts to the head are too small making installation difficult , the only good thing is that I don't have to use a 90 degree oil filter adapter. I am looking at set of stainless steel headers but the don't make them the W2 head bolt pattern like I have .