I prefer to leave the DBW harness the same to ensure that any failsafes in place will remain active. Not saying this will cause an electronic throttle failure, but its like others have said.... get the car tuned with uprev. If you want quicker rev consider a lightweight flywheel when you upgrade or replace your clutch. Overall not a fan of aftermarket DBW throttle controllers.
Thanks,
Alex Goodwin
AlexG@motionlabtuning.com