hey people need a bit of info

my mjet is remapped but im planning on gettin a exhaust made back box and straight through pipes n that
will i need to get it remapped again or will it be ok

it will be fine mate, a remap is mapping the computer on the car a back box and stainless is just an add on feature.

It will run ok but you could get even more gains with an additional tweak to the map.

is tuning different from a remap?