Let me explain, Steele. This part of the forum is for the very first Landrover series. From 1948 to mid '50s. Your Discovery is just on half a century later and this is the forum section for you: https://www.aulro.com/afvb/discovery-1-a/
As for your question, however, well may you source another air box and guess what? You'll blow that one up, too. Others may know the secret, but I could never get the one 3.9/LPG I ever worked on to stop backfiring and destroying air boxes. Mind you, we didn't spend any money on it.
				
			 
			
		 
			
				
			
			
				2013 D4 expedition equipped
1966 Army workshop trailer
(previously SII 2.25 swb, SIII 2.25 swb & lwb, P38 Vogue, 1993 LSE 3.9V8 then HS2.8)
			
			
		 
	
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