Hybrid turbo upgrade selection & general tuning question

[Pete_89T2]

Not sure if this is the right place to post this one, so mods feel free to move elsewhere as necessary. It's more of a general question, but since it applies to a 2nd gen, I put it here.

I have a nearly 100% stock '89T2 which is in need of a turbo rebuild. Car is meticulously maintained, and it's drivetrain has been super reliable. Only substantial engine-related mods to date are a downpipe to replace the pre-cat, a Borla cat-back exhaust, and a K&N airfilter, oil thermo-pellet mod & partial TB mod (retained thermowax fast idle). Upgraded radiator is on its way. The stock turbo will be out of the car this weekend, and I plan to ship it off to BNR for the rebuild job.

For the extra ~$150 or so, I'm thinking of going with the "stage 1" hybrid upgrade BNR offers, which adds to the stock rebuild work waste gate porting, a bigger compressor wheel (T04b V-trim) that fits within the stock compressor housing (housing is machined to fit), and they clip the stock turbine wheel a bit. All in all, BNR claims this stage 1 upgrade can support up to 300~320 rwhp with the right tuning & setup mods. My understanding is this upgraded turbo will flow a bit more air volume, but otherwise performs like the stock unit WRT spool up, at boost pressures consistent to the stock setup (7~8 lbs boost on an S5).

I realize to achieve the HP figures advertised, I'd have to tune the fuel mapping & spark to take advantage of the extra air volume this upgraded turbo can push and/or run it at higher boost pressures than stock, and I won't get there with the stock ECU. But I'm not chasing HP figures and I'm OK with the stock power for now.

So my question to all the turbo tuner gurus out there is if I run this stage 1 turbo out of the box, with the stock ECU & boost control setup intact, (i.e., limiting boost to the 7~8 lb range), will I run the risk of grenading my engine?