I found that I can run more boost and more timing with another nozzle pre turbo.
It also has been found to greatly help small turbos running at the top end(or past it) of thier efficiency curve. Like running a 16g at 27psi for instance
But I also found that(not on my car) that it will indeed cause backfiring if you run too much injection with straight methanol in the pre turbo setup. Right Marke?

It did it on my car too, with my 250 psi pump and straight methanol I had to lean the piss out of it, and it would still sputter a bit.
But properly tuned it works very well.
But Remi, first you have to have a turbo on yer ride yo!