Which brings about the point, they're a waste of money.
Even street tunes can be pointless.
The only things you'll ever notice are the transmission settings.
Mechguy had a reptile PCM which caused more KR than his stock PCM.
He finally gave up and pullied up IIRC.
You're not going to get much better performance without dropping a bunch of cash.
Just enjoy your car as is and don't worry about.
This is all assuming you've already monitored for KR under numerous conditions for an extended period of time.