I know some will say Crank Pressure, or Piston rings...

Simple Answer, Sometimes not.

Could be,

1.First i would remove all pipe's that lead to the Oil Breather system, and also remove the Oil Breather system filter. - If still poping off and gunk inside the hoses then take option 2

2. Second, get the engine Compression tested. This would then tell you if of course a ring is worn, turned or anything under them lines, also would tell you if any crank case Compression/engine compression is happening. should all read Green/8ish, if one is down, or more, then that could well be the problem. if all read the same then all is well.

3. Check for smoke, your turbo would not lead to anything, remember, turbo is a second part, it will smoke if fucked or shaft play.

Performance on Mfi is very common, so don't be fooled with that, they do sometimes play and sometimes do play up.

Of course check for smoke, On idel, under load, on over run.

Oh and if your running Std breather system on up rated engine/ more power than Std there is a problem, and you need a kit, Baily's are the best.




PS. Dont give the car too much stick if any until this problem has been resolved, you could well lead into more problems and if its a simple new rings, then thats not too bad, but if it needs more you'll be spending.