simon read what stu has wrote though,, as a saftey aid its a good thing,,, personally i think ANY car should have a check up before modding the car to see if theres any issues with the car HENCE i aint touched the scoobie yet as i aint had it looked at and told what needs doing BEFORE i start ripping shite out then wondering why its gone wrong,,, then blame the mods done to the car ect

for what your asking for i cant see it being any better,, there ARE better parts of it but for the reason you need it for,,, 2 mile drive to work in traffic,,, you aint gonna notice IMO though ive never had stu's closed loop,,, i just know that when my lamda sensor in the BMW was fucked i changed it and i still had shite fuel economy round town, was a little better but not " shite, its like im driving a fiat panda" fuel economy

oh and my scoobie its fine on motorways but still shite when i use it to comute as i drive 4 miles up hill in traffic,,,, i done a test and i can get 3 times as far driving at night with no traffic as i can just driving in the morning IN traffic in the scoobie

good mod i think closed loop is for emissions ect and the engines life,,, but it aint gonna give you 30mph driving to work that people seem to talk about