What kind of donuts u like lol
I was going to go with 3'' but couldnt get it to clear the linkage 
2 1/2 '' is largist tub that i could get to clear
The I.D of pipe and the large end carb are the same
I was thinking of runing anther tub around the other side of the linkage but didnt but still might
Id like to keep the same power as before but i got to protected my engine
Ive not tested this yet ben working ot and got to watch baby in ev
what size tub do u recommend if i didnt have clearace problems
Thanks for the input
Paint is a welders best freind