i just had my car replaced with a totally new motor back in 1999 at 100000k, by mazda canada. I have bought the car last june and it only has 30k since the rebuild back in 1999. I was wondering how long will the motor last?if i do proper maintenance such as frequent coolant flushes and oil changes which i do very frequently.

 

with your current setup (downpipe, midpipe, no ECU) im assuming......not very long.

 

do you have a boost controller with the MP?
if so, keep the boost at 10 psi and you should be fine

 

If you keep your 7 properly maintain, have sufficient fuel for your mods then it should last a long time. Keep an eye on your boost gauge for spikes, it's a bitch.