I got a response from the guy and this is what he said: 
 
Question 1. Does the bigger pump make any difference on the performance? 
 
You can add a ball valve to lower the output of the eheim. Other than making the reactor more cloudy, I don't really see any issues with a higher flow rate. 
 
2. The second question is the obvious one, how is everything working out for you? 
 
I am very happy with the mod. I have switched to ARM media instead of the deltec ROWA C+ or whatever it is called. It dissolves much easier and tends to turn muddy a lot sooner. The added power of the eheim helps to push the water throught IMO. 
		
	
		
		
		
		
		
	
		
		
	
	
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