Hello James,very surprised you need one,but thats your choice.Although they work in a fashion,they are very crude,and basically a resister pack.The other problem is the knockon effect on the driveline.If the driveline wasnt an issue the best bet would be a proper Recalibration(remap)of the affected control unit in your case EDC.A plus point is the recal is undetectable to say a service centre.