An MX6.com forum user by the name of “copex” has welded additional blades onto his turbine wheel, claiming that it lowers spool-up:

I took off my old T3/T04e 57trim and welded 1/2 of the fins (not fully closed shut as you can see) on the hotside used to spool @ 3000rpm & get 5psi @4000rpm now only 2400rpm & get 5psi by 3500rpm.

way more torque(throttle response was amazing too) @ around 2000 rpm it feelz like my dads supercharged v8 now ^^…. weight increase by a total of 3.5grams (6 fins) + maybe 2-3 more grams from the stainless steel weld spots (pic was taken when finz had minimal weld spots). btw it has a bit of the whining sound when spooling … I like it alot but letz see how long it’ll last.

We’ll ignore his ricer internet lingo for a moment. As you might expect, the sensible and intelligent people on MX6 forums explained all of the failure and idiocy inherent in tack-welding fins onto a turbine wheel. Evidently copex has a history of what he calls “half-assed jobs”–and this is just one.

Here is the full thread. There is some risk of it getting deleted, but don’t worry. The Pansy Patrol is working to rehost the thread.