Installed a GFB DV+ Man, that was an adventure. Went to Harbor Freight to get an extended length 5mm allen bit, and that was a good call -- it would have been very difficult without it. I was surprised and disappointed that the stock solenoid had a fair amount of tiny metal particles on it -- I'm glad to be rid of it and the brittle plastic that the DV+ replaces. I think it's a good upgrade even if the performance benefits are negligible.