Frank
Just two spares at present. I may become a collector though!!!!
If you open both bonnets and look at the clearance at the top, there's a good usable half inch. The problem though is width, and the engine is very close to the bonnet sides. The limiting factor is where the downpipes go through the chassis, and there's probably less than half an inch there. So spacer washers might gain a quarter inch or so, but no more. You may also have to loosen the sperical exhaust joints aft of the cats to let the exhaust realign. Stainless steel can fracture if stressed too much.
