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Hello:
I am of Spain, I have a Evo Viii GSR, with cams Brian to crower 272/272, to air intake ARC, line of escape Tsudo N1 3" , test pipe Megan-racing, am going to install roms of ralliart edm, I need to modify some square of the ROM? , I have understood that the roms ralliart come very poor in the mixture. It is necessary that it buys wideband LC-1?

Best regards.

Michael.

P/D: Sorry, my english is very poor.

If your planning to do any modifications to the fuel and timing, then a wideband is a must really.
I would think midrange would be very lean, with Ralliart fuel and timing tables, when using 272's.