I'm sorry to say, but even though that's a damn nice sound mod, and the handling doesn't look any different to the standard infernus, the .dff change will have affected how the car handled the bump.
For example, take the infernus line. Put it on the turismo. The two will handle the same bump differently because of the shape of the cars...
Meh, tis up to you guys to decide anyway.
Sly.