i fitted a custom one to my car, i got it from allard motor sport they do a lot of deisel tunning.i payed about ?250 for it and then plumbed it in using samco hoses and ali tube. total cost was about ?330 and its very good. after a good hard drive it still feels cold and does not heat sink.my car is puting out 240bhp and 255lbs of torque so im happy with that....
All depends on the volume of the core you want to pressurize. No noticable lag but it does seem more willing up top with better cooling.... need a remap to fully see how mine turns out..... give us about a month, NEE FECKIN MONEY!
No noticable extra lag... the attitional piperun isnt that great due to some very well crafted silicone hoses 
It does feel more gruntier (if you know what I mean) and spools up very freely/smoothly. Another dyno run would be interesting as the intake temp will be lower and therefore some more BHP shoudl be achieved 
I was emailing jabbasport yesterday to see if i would need to get my map tweaked with an FMIC and elton happened to mention they currently have a FMIC in development due to be finished at the end of the month. Price was to be around ?650
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