'Typical' modifications to one of the nicest trainers of them all - the Sig Kadet Senior:

Remove most of the dihedral (at building time). Not all - a perfectly flat wing looks, lots of the time, as it's drooping. Leave 1/2" or so. That ain't much on that big a wing.

Add ailerons - the original wing doesn't have any. So, you're flattening the wing (originally a 3-channel plane with lots of dihedral, right?) and adding ailerons.

Convert to a taildragger.

Add wheelpants.

It starts looking less like a trainer and more like a plane, and it flies differently. 'Better' is in the eye of the beholder - I personally like a big 3-channel plane for those dead-calm Sunday venings.....way relaxing.

Don't even ask about the low-wing Kadet Senior I saw years ago.....