by having a lambda kit..you have a computer in ur car which is regulating the input of gas all the time..by the input of two thing..
how much accelerator are you depressing..
how much unburnt oxygen is going out of the exaust
and there is no need to get the car tuned up every week..or whenever you change cities..
to be honest..i have not driven the car much afer lambda to mention the details... hardly 300 to 400 kms...and it is still under process of finding the best lambda setting for the car.... but it is running as good as it was before..with 5 more kms to every cylinder... the art is the setting of the lambda kit
My car was even doing very good without lambda...so the difference is not huge..but still considerable..
Honda Exi is not a problem...contact Aamir 03335585987 in G-10, Islamabad you can get ur exi converted from him..
my car does not stall at idle at all...the engine never shut down...this is a problem with Hondas...but there are solutions to overcome this...i got my cng kit reinstalled from this guy Aamir, after that this problem didnt happen...(its easy to rectify the problem in Exi)
One thing is worth noting that Hondas do require regular tuneups.with filter cleaning or replacing...a but earlier than toyotas....