Problems with rev and idle

[Jeffers_21]

I Changed my exhaust yeasterday and put a mid pipe on aswell. ive got a boost controller that is limiting the boost to 0.5bar it\'s pretty stable boost all the way though the rev range. i know people say you should do the mid pipe after you have done the ecu but my cat was nackered and being my only two mod\'s (apart from the avcr) i thought this should be alright.
 
however today was the 1st time i took it out and tried it. im having problems with the car hunting at idle. it sounds like a leaky vac somewhere as it only does it when warm and when you put your foot on the clutch and put it in gear it steady\'s out. its hunting from about 650 - 750rpm. any ideas on what this could be?
 
also when puting your foot down a bit it feel\'s quite slughish at 1st you get to about 3500 and it pick\'s up again, when 2nd turbo kick\'s in it fly\'s untill about 6000rpm when it start\'s to loose power. it just wont go any higher than 7000rpm
 
now i dont know if this is anything to do with it but i did brake the cat overheat sensor when trying to get the soding rusty bolts undone on it, so the cat overheat light is on at the mo, someone told me that if i join the two wires it will make the light go out but havnt got around to doing that yet.
 
 i only took it out the once then brought it back home as it just didnt feel right.
 
any ideas?

[Jeffers_21]

Bump
 
someone must have an idea