Pretty new to cossies well especially working on them and I want to freshen up the engine on my k reg 4x4 saph which I will be attempting myself. im lookinf for around 400 bhp its running a smokey 340 ish at moment.this is were im getting confused wats a p6/p8 wats coil pack conversion and closed loop and wasted spark all about do I need this for 400 hp im planning t34.63 siemens. Ported and polished head and bd cams vernier pulleys . Do I need to change chip to run siemens as on greens at moment I hope its not just me being thick wen people talj about this stuff round me I just nod and agree wen really I aint got a scobby do wat there on about -.........carl