Fuck knows, what bore is it? Are the silencers straight thru? Providing the bore stays the same all way thru u should be able to predict its potential.

IMO 3" would be too small (thats even a bit restrictive at 500bhp), but 3.5 should be fine for 600. Even a 3" wouldnt be a big restriction if you ran a seperate screamer pipe for 600.

Go ask on the GTR board you goon, im sure some people run that system and have looked into its potential.

We not that likely to know, i got a custom mega bore side exit to be made and got rid of my Trust system without looking into power potential, it was 3.5" bore but decided that wasnt enough.

Deanos got a 4" bore drag system.

And who else is likely to know?