I find some of those mods questionable but the one you're mentioning looks to me like the exact hoses that '94 turbos came with before the campaign (or recall?) where we removed those and installed the newer type (plus a few other items) you now have.
It made NO difference in HP or lag whatsoever as that theory is flawed really. The slight difference in volume of compressed air inside those hoses is not enough to make any practical difference.
With those old style hoses like they're trying to sell you, they were known to cause throttle body icing, the throttle could freeze opened at extremely cold temps and that's why Volvo spent ALOT of money per car to change that at the dealers in the mid 90's ('94-'95).
We also returned those hoses to Volvo so that's what it looks like they're now trying to sell you again, old returned warranty parts that were probably scrapped.
Another device I'd question is the larger throttle body as the volume of air entering it is already pre-determined physically by the diameter of the turbo, intercooler, intercooler plumbing, etc and I can't see how that could possibly add 25HP to a turbo engine. I wouldn't buy their polished parts either.
I am getting a high stall (2600rpm) torque convertor from another place for my 745T however as that should cure initial take off lag. That'd be a costly item installed in a FWD however, it's easily installed in a RWD in comparison.
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