here is the projected tip spark plug for the DS: http://www.geocities.com/turbo_davec...jected_tip.jpg

 

Are those projected tip plugs the ones that are supposed to give an extra hp or two; but if you leave them in for thousands of miles, they may weld plug to head? For any kind of racers, you couldn't beat an extra hp or two for the price of a couple of plugs and routine maintainance on them.