Not to sure about those weights... 125lbs for manifolds??   From my info, the complete 3s engine is 15kgs heavier than a 4age, and you can mount it way back in the chassis. 
 
 The idea of these cars is that you put whatever engine you want in it... it's all about the fun! 
		
	
		
		
		
		
		
	
		
		
	
	
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