I highly recommend nistune. There really is no reason to go with anything else unless you have a special requirement it can't provide (launch control, anti-lag, auxilliary outputs to trigger nitrous/meth injection, 2 step limiter). The only thing close (cost wise) is the maf version of the pfc. It is alittle more expensive but arguably easier to use because of how comparatively few variables the user has access to.
They recently released a new version of the tuning software that incorporates a knock readout. 4x4le could definitly elaborate on that.
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