ba bf flapper smaller then fg?

[jas98]

hi. so I needed a replacement rear houseing as mine was cracked in a few places. I have a ba xr6t stock tune. 

 

from day one when I got car I was told something about it haveing a fg turbo but didnt really make sence. 

 

anyway from what I have gathered now. is that it had a 8psi actuator as it was over boosting heaps but now I have a stock one on it it does not overboost. 

 

but. now that I have the replacement h s exhaust houseing it looks like the one on ot now has a different sized flapper and hole as opposed to the stock ba/bf one I got. 

 

from some reserch ihave seen is that the fg had a larger flapper from factory

 

so........would anyone know why the previous owner may have done n this with a stock tune? 

 

im yet to put it on but surely it wont make a difference being stock sizzed flapper on a stock tune lol

[BAXRTUTE]

Maybe just maybe the car wasnt stock before he sold it

 

And the FG turbo spools heaps faster then the B series.

 

If your changing housings and turbo id suggest putting it on a dyno to smooth it out and also get some powwwwwwwer

[jas98]

that's true....was mentioned it was tuned to 18psi but then blew turbo so replaced with brand new one etc and back to stock tune . will have to seenhow it runs after change houseing