have a look throught the traders on here mate, manifold and de cat prob try WEPR (Wicked EP Racing), Zisco or Race tech get a mild steel mani though as there stronger and meant to be longer lasting than there stainless steel counterparts. Fcd try the for sale section on here, or put up a wanted thread. maybe ebay? HKS and JAM do them, Jam are meant to be better FSE or sard for the fuel pressure reg. If your upping boost id definately get a boost guage, in fact id prob make that the first thing id get, you want to see if your boost is spiking/ creeping and this really is the only way. TMD and Tuning developments do the actuators, or again try the for sale section on here. (ive only noted traders that have come into my head, try all of them may get better price elsewhere, and the brands ive said, id stick with them for manifolds, and the feul regs, but its up to you what you go for and your budget. theres a fair few £££ from what ive listed above really. to save money on a mani, you could maybe port your stock one. there are some threads on here how to do it. but it will take time and a fair bit of effort. hope this helps, matt