I have a 2014 370z that I recently bought a SprintBooster for and is having issues clipping in place on the SprintBooster connector side towards the ECU side (peddle side clips in fine from the SprintBooster). Purchase was made from MiniMania.com. The issue lies with the sprint booster connector itself. The plastic material is very cheap plastic so the issue does not surprise me.
I had reported the issue to Ken from MiniMania.com and he asked that I send him pictures of the issue which I did. He later responded that he will get in contact with his engineers. So it's been weeks and still waiting on a response. The issue is not that complicated as the problem is with the locking tab shown below. I took the liberty upon my self to just fix the issue since the company I bought it from is simply none responsive at this point.
The red area shown in the picture is where the factory female connector end from the ECU does not fully lock in because the first square locking notch sits too far back. The issue can be fixed if I were to just file a little bit of the plastic notch away shown in red.
This is not a exact picture of my sprint booster, but it gets the point accross.