I was thinking about the GT40 manifold, however Rob and Jeff from Herrods said the tubular type is worth small numbers over the Explorer type. The Explorer type is basically modelled on the GT40 anyhow. It's something like $900 for 5-10kW from memory.
BA'1.5' Pursuit 290
Lightning Strike / Reflective Orange Stripes
'General' Dog - AP's German Shepherd and Best Mate - 02Dec1998-15Dec2003.
'Pepper' Dog - General's and My Little German Shepherd Sweetie - 1996?-02Apr2006.
'Sako' Dog - My Beautiful and Pretty German Shepherd - 2001?-23Aug2006.