First, we have to know that the more taps an FIR filter has, the more expensive it will be. Then, the original sentence is like this, "The reduction in number of filter taps using the system in Figure A compared to the number of filter taps needed by the system in Figure is 451.". What I want to do is to add a comment to this sentence to express that 451 is a very big number. So we have
OK, how about this: The system in Figure A uses 451 fewer taps than the system in Figure B. This sizable reduction in the number of taps is responsible for huge cost savings.