is this idea stupid?

[Ramsay]

Going to install a new exhaust on my car but to do so the standard exhaust needs to be cut 80mm from the lambada sensor.  Is it a stupid idea to cut the exhaust whilst its on the car?  My only fear is damaging the lambada sensor.  I was going to use a 4 1/2" grinder with a 1mm blade to cut it.

Any help would be appreciated.  Failing this I will just take it to my local exhaust garage to fit.

Thanks

[Luka]

For what it's worth I'd take it off the car. Working with an angle grinder is dangerous at the best of times, let alone above your head under a car. Just my opinion.

[Ramsay]

For what it's worth I'd take it off the car. Working with an angle grinder is dangerous at the best of times, let alone above your head under a car. Just my opinion.

Was thinking of that as well lol.  I will probably play safe and take it to a garage :)

[Andy]

you can get a proper exhaust cutter to do the job

[Andy]

like this..use them all the time at work
http://www.justoffbase.co.uk/

[andybon]

Last time I did an exhaust under a car, working over my head on a jack, I knocked myself clean out! Swinging a lump hammer above your head and not concentrating doesn't really work :/