The Bosio nozzles are the only things that I have herd of for extra performance from the injectors. From what I have read people say the fell a differance after installing them. Do a Google internet type search and there is more info. If you go to the official site (just searca Basio injectors) you need to register to view the nozzle prices which a year ago were around $37 each.

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84 300D, 82 Volvo 244Gl Diesel