Yeah, but may not be worth it. Here is my theory. You need to play your system OUTSIDE of your vehicle. Across the audio spectrum, like, 20-60hz. Play it and measure it at a certain db level. Then, you do the same once your system is in the vehicle. This would be how you would measure your cabin gain. By tuning, I'm guessing you mean your vehicles peak frequency? If you so, there is a mathematical way to find out. I forget exactly, but I'm sure you can google it. It something like, you measure the passenger footwell to the driver side rear hatch. You then divide that number by the speed of sound. again, it's "something" like that lol. There other method i've heard, is to build a sealed box, and find it that way. But again, everything will play differently once the system is installed. That's why I said it may not be worth it.