Quad conversion query - pipes behind bumper

[Z4_ATB]

Looking to do a quad conversion and started to cut a rough shape out before a fine template shape - and suddenly found this tray and black pipes - anyone any idea of what they are as now concerned I can’t do the conversion as other pics do not show these?

 

[markplant]

Pipes could be to do with charcoal filter

 

[Z4paul]

I'm sure i have read about folk avoiding this conversion or needing to make sure any replacement exhaust allows for the current position of the battery and tray?

 

[TheDan]

Not sure what the pipes are for... but looks like you'll have enough space to get some aluminium heat shielding to go around the exhaust. Not sure how you'd get it in there though. I think it would have to be a bumper remove job.

 

[Z4_ATB]

Turns out it’s the fuel tank evaporator pipes - they just need pushing out the way and tying back