No problem. Improved Electrode design, which leads to longer life and less likely to overheat. More stable under high cylinder pressures, transfering more energy to the charge.

It is relative though. If you run coil packs etc then the 071's are all u'll ever need. Im stuck with shonky RST ignition system, so have to make improvments else where. My data logging kit picks up missfire's via the wideband lambda which u can never feel, but are essentially costing you power. The 071's arent as good as 701's, but are easily the best sub 50 quid plug out there.