ok the headers are to go onto a a14 which will be heavilly modified, port, polish, BIG cam dubble valvesprings, large (as big as i can go) valves, modified rocker gear, twin 40s, shaved head and decked block (12 or 12.5:1) 1mm overbore, everything balanced lightened (not to light) and I want a set of headers to suit. I want lots of mid range pull and a good high end, I dont care about low range as it wont be driven on the road.