bit of an update on this
met up with Anthony who works for SFS Performance Hoses who kindly took some measurements for the hoses - i need 4mm and 5mm
he also mentioned that there are various kits available for the MKIV so might be worth having a look
www.sfsperformance.co.uksadly you need to mention *cough* ukmkivs* cough* but you will get a 25% discount
