F.a.o Oliver Knuf.
 

HI OLIVER,
I E-MAILED YOU A FEW WEEKS AGO ABOUT ONE OF YOUR 911 STYLE COOLING KITS, WHEN I USE YOUR SET UP DO I STILL HAVE TO USE THE TIN WARE UNDER THE BARRELS. I WAS WONDERING THATS ALL BECAUSE ONE OF MINE IS ROTTEN ON ONE SIDE AND I WILL HAVE TO GET A REPLACEMENT IF I STILL REQUIRE THEM. CHEERS.:confused:

Although Oliver should answer this one of course, I can pretty sure say that he will strongly advise you to reuse the original tinware.
BTW He has also used it on his own car (beige colored, tinware visable in the featured article in Speed magazine) with 911 style cooling system.
Walter

...
 

The air tins have to be used, sure! :D Thx for the answer before! They are very important for the cylinder cooling beneath!