I did this mod on my 2008 Supra with the Indmar 340 when I installed the hotwater shower, it worked great to quickdrain the block. My son is going to be getting a dry suit soon so we might be riding a little more in the winter months, it would be great to add this to my VLX to drain the block out after we are done riding. I never had any issues with this, some mentioned the knock sensor needs to be directly off the block, but I never noticed any issues with 230 hours on my last boat. My broth