Exi has 2.2L non-vtec engine i think.
Vti is 2.2L SOHC Vtec.

Exi has cloth trim, not sure if Vti has leather, but i kno Vti-S has leather.

This is from www.redbook.com.au:

Vti - 6 Speaker Stereo, Air Conditioning, Alloy Wheels, Body Colour - Bumpers, Central Locking, Cruise Control, Electric Seat - Drivers, Power Steering, Power Windows - Front & Rear, Radio Cassette, Sunroof

Exi - 4 Speaker Stereo, Air Conditioning, Body Colour - Bumpers, Central Locking, Power Steering, Power Windows - Front & Rear, Radio Cassette