[simon455]

Definitely more use of quality rubber bushings on swivel ends like dse or speedtech
Propeller shafts that incorporate guibo and cv joints
Use quiet gear sets/get them right in those 9” Center sections out there
Engine mounts! How about oem hydraulic style type, tranny mounts as well, oem type
Isolated steering column mount/kits
Seats/seat tracks for taller dudes
More bracket/adapter kits to adapt modern oem big calipers/rotors
Subframe that would allow you to drop in a ls/lt or possibly other engine
Without relocating lower mount Ac compressor or alternator
Double din or a tablet radio bezel/brackets
Modified wheel well housings to accept bigger tire sizes, more affordable than carbon ones
More variety of oil pans/bigger capacity pans >5.5qt.

These are just some ideas