not to bad pending your in perth lol.. its alot harder to do it with out the car as you dnt know clearances ect, however i could do the gate same as mine and you can get screamer made local, aslong as i can get ahold of your gate flange ect wont be a problem and it will be much cheaper than any china manifold!!!
also just incase your worried about it holding power back heres a graph and pic of my car now that its done. 362rwhp