Thanks Frank.
jfk has put me in touch with his supplier by private message.
If he’s OK with it, I’ll post details once I have them in hand and then it will be a permanant search for those interested.
can you share the PN jfk?
i found these but they ain’t blue
blue ones looks like to be 680cc
Yea 661 go ahead …
My only concern was breaking peoples gearboxes for them !!
The problem with my 440’s (and worse with the 550’s) is the fueling at idle/low rpm. Its not brilliant because of the spray pattern.
Injector dynamics is a new generation of injector, which is why you can get away with 1000cc and have perfect fuelling at idle.
Personally I’d be giving Tdi a call and giving them a try.
When I spoke to Wayne at Essex he said the Denso 440 was a nice bit of kit. When i asked him about the RC550 and if they were as good technically, he waffled a bit and said the spray pattern wasn’t quite as good but I wouldn’t notice the difference (which may be true but didn’t fill me with confidence)- hense the Denso.
Intrigued by the Injector dynamics but i’ve taken the plunge.
I’ll post the Part number when i get them but ordered them through Paul at Co-ord Sport
http://www.coordsport.com/
�307 inc delivery and Exiges.com discount!!
He has the part no. if interested under my order- Graeme Brown
I ran RC 450-550-650-750cc injectors and never had a problem with them… But what do I know…
Exactly!!! Glad you are finally talking sense Frank!! 
For those still awake on this thread, the part no. is:
Denso/ Deatsch Werks 22T-00-0550-4
For those with chronic insomnia there is a tech sheet if interested.