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		I'm no expert, but having driven my 347 for 2 years, I know what you're saying. Currently, I have 306RWHP. I figure that 400RWHP would get my attention, although my track times can still improve a lot with the motor as it is! You need to know what you have already. 
Richard 
		
	
		
		
		
		
		
		
		
		
		
	
		
		
	
	
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