The only issue with the greys is they will be on their knees after 400bhp.

Closed loop allows a level of fuel control the YB has previously only dreamt of on high flow injectors, and its not all about fuel economy. As well as hurting the pocket, excess fuel can hurt the whole engine by contaminating the lubricating oil, thus wearing the rest of the engine very fast, and shortening the life of your oil dramatically. The other issue is cold start and running performance.

Done properly, using my latest software, you will NOT be able to tell if your engine is hot or cold when you drive it or leave it idling (no daft hunting) unless you look at the temperature gauge. That is FAR harder to achieve on normal software as well as pectel, but with the latest software we can have virtual perfection.

The closed loop can be applied to any injector, so theres no reason not to go for it unless you dont actually plan on driving it anywhere, but engine issues aside, why do a 200mile round trip to a show at 15mpg iof you can do it at 32+mpg instead? lol