I realised how little all this ex mani crap means when my destroked 1900cc b20 made 237hp on a old DC 4-1. and the only non Honda internal part being its pistons..
Just removed the Toda from my DC2, I went from full toda system to toda mani and Tanabe exh (notice a bit of top end power loss) then swapped the toda mani for a '98 spec DC2 one (very noticable loss of midrange and a bit of top end gone). Full Toda setup was awesome but a bit lairy (think angry spoon N1 with an asbo! louder with a more aggressive tone)