i have teflon lined braided hose, it's just a prick to work with. i'm planning on replacing it at a later stage. it was put together by possum bourne and is specificly on the cert plate, so i doubt it's that much of an issue with what's used. the reason i'm considering the possibility is i'm thinking about putting an amp in the boot, and as the car sits for two weeks before being used, the vapours i guess could build up a little bit. i imagine when an amp switches on it could possibly emit a small spark at some stage in the process