Thanks Mick, shall see how i go... Might look at getting some extractors made up as no one seems to have any yet... Cant be too difficult for my exhaust guy to work thru. Ive been doing some reading about making headers/extractors this morning. Very interesting. Suggestions seem for a 1800cc, max usable power at 5,500rpm. 38mm primary pipe diameter, 860mm long, collected to a 63.5mm collector. I have found some software that you can input all matter of engine dimensions etc etc to help you build the most effective setup. Im wondering if i should buy the software, think its only around US$50. Ill keep searching and learning till i come up with more info. Advance headers are just up the road from me, ill have a chat to them on monday see what they come up with, looks like they have done Toyota 4's before..