C30 T5 custom remap

[elliotc30t5]

So I own a 2008 c30 t5 (b5254t7 I believe) and have been slowly adding bits to it to get it ready for a map over the last year or so. The time has finally come to get it mapped but I am struggling as to where to take it. I've seen plenty of places offering generic maps but I really want to avoid this route and get a custom rolling road map as the car is modified and I want to safely get as much power out of the engine. The only decent option I have seen so far is dreamscience. Has anyone had any experience with these? I see they do a lot with the st's and they seem to know their stuff but I live in a stoke so they are a few hours away and I'm just weighing up my options at the moment.

Current mods I have at the moment:

K&N typhoon induction with hardpipe kit
AS performance alloy inlet plenum
AS ported and polished inlet manifold
Forge recirc valve
Forge wastegate actuator
Elevate tcv
Do88 intercooler with hardpipe kit
Jetex cat back
AP coilovers
Elevate torque mount
(currently running about.8 bar of boost)

If anyone has experience with mapping this engine what other mods would you recommend? I.e. Focus RS injectors, uprated fuel pump etc.

Also when I get the car mapped I will be fitting a 3" downpipe and a 2.75" decat, however, the cat back is 2.5". Does anyone know if this will cause flow problems or anything? (I cant find any smaller diameter downpipes)

Any information or help anyone can provided will be greatly appreciated!