Well... this is my first BMW, and I own it 2 days ago and I`m fascinated, really sweet ride, heres some specs I got from carfolio.com.
Technical specifications of 1991 BMW 325i
dimensions & weight Wheelbase 2700 mm 106.3 in
Track front 1408 mm 55.4 in rear 1421 mm 55.9 in
Length 4445 mm 175 in Width 1702 mm 67 in
Height 1392 mm 54.8 in Length:wheelbase ratio 1.65
Ground clearance 108 mm 4.3 in
Kerb weight 1295 kg 2855 lb
Weight distribution(Front) 51.00 %

aerodynamics Drag coefficient 0.300
Frontal Area Cx
Engine Type S-6
DOHC
24 valves total
4 valves per cylinder
Main bearings 7
Construction Bore ? stroke 84.00mm ? 75.00mm
3.31 in ? 2.95 in
Bore/Stroke ratio 1.12
Displacement 2494 cc
(152.193 cu in)
Unitary capacity 415.67 cc/cylinder
Compression ratio 10.00:1
Fuel system Bo DME 3.1 fuel inj.
Aspiration Normal
Max. output(DIN) 194.7 PS (192.0 bhp) (143.2 kW)@5900 rpm
Max. torque(DIN) 244.0 Nm (180 lbft) (24.9 kgm)@4700 rpm
performance
0-50mph (80 km/h)
0-60mph 7.30s
Suspension M-technics
break pads FERODO.
in top
0-Quarter-mile 15.80s
0-Kilometre
Top speed 227 km/h (141 mph)
Fuel Consumption
CO2 Emissions
Power-to-weight 148.26 bhp/ton

Anyway, first modifications will be audio system cause it still have it`s original radio and speakers.

Coming soon, engine and interior pics.