Just unplug the MAF and go for a drive , if it pulls better then you need a new MAF if it is horrible and feels worse then it is likely to be something else, I am having issues with my LCR too and it is getting to be a real joke now seeing as I have only had it 2 months!
sounds to me like its the maf or boost leak.
Can you hear a hissing noise from anywhere in the engine (other than the turbo?). When I popped a hose I lost most of the power and could hear air escaping. If you can't hear any leaks, I'd look at the MAF. The N249 Bypass won't through that code up, that'll show a 17608 and another one I can't remember, but not the one you mention (they both relate to solenoid and open circuits. I.e the N249 solenoid)
Just also thought, as mentioned ooop there ^^^ could be a leaking DV, but you'd hear that hissing too I think
as said by russler i unplugged the MAF plug and wow what a power

in reply to APE , nope no 'unusual' hissing noises , im guessing i would hear them from just revving it up with the bonnet open? , but i also didnt heard anything when i drove it, as well the n249 it did still have the chunky block in , but ive just put in the resistor that IE sell and its not throwing up any codes
cheers for all the help guys , pretty sure its the MAF , would haveing a faulty MAF decrease power? since im only seeing 190 bhp ? i know that when i did remove the plug it pulled so much nicer but would having a faulty one decrease bhp?