Ok, MSP is also different from MP3 in these:
From
TheMAN's FAQ
What is different about the MazdaSpeed Proteg other than the turbo, suspension, body kit, color, stereo
system, brakes, drivetrain, exhaust and wheels?
There are many additions to the MazdaSpeed Proteg through the use of various European and
Japanese spec parts. Some of the highlights are:
Different oil pan for oil return line
Radiator used from the turbo diesel 323
Intercooler used from the turbo diesel 323 (meant for the RF-EI engine)
Additional fasteners to existing vacuum lines
Water cooled oil cooler unit mounted at oil filter fitting
Different front and rear O2 sensors
Different fuel injectors
Larger brake booster unit
Anti-reversion check valve on clutch master cylinder
Stronger release bearing and clutch pivot fork
air by-pass valve modified and used from the FD RX-7's