Just as a hint: What you want to look for is the CLK airbox - it has more volume after the filters, uses larger air filters&tubes and has more airflow. That is the one TVT is selling and for this airbox you may get the custom tubes from them.

The SLK airbox on the other hand is just for the looks and is pretty much as restrictive as our airbox. For this airbox the intake tubes of our cars can be reused (same diameter).