I ran a stock hx35 with my tst and 100hp sticks and it would spool before you even thought of hitting the throttle. The temps would hit 1600 before i could hit 100mph. I have a pdr40 on there now and i feel its a really good match. With the tst on anything from 5-9 it spools quickly and is a good around town driver. If the transmission grabs a gear early than it might lag a bit and belch some smoke out (but that depends on how hard the loud pedal is pushed
.
I did notice though that with the tst on lower levels like 0-2 i would only hit about 30lbs instead of 40lbs with the higher setting.
I've been told be a few people that the HX40 is not a good towing turbo. I think you probable need more fuel especially for an 18 housing, and your 3. 54s might cause a bit more turbo lag than 4. 10s.

I did notice though that with the tst on lower levels like 0-2 i would only hit about 30lbs instead of 40lbs with the higher setting.
I've been told be a few people that the HX40 is not a good towing turbo. I think you probable need more fuel especially for an 18 housing, and your 3. 54s might cause a bit more turbo lag than 4. 10s.