100 Proof,
We use our truck almost exclusively to tow a 13,500 lb 5th wheel. I bought the TAG specifically because it should show an advantage in high air mass flow conditions (like full throttle up a 6% grade at 70 MPH in 6th gear).
There are three primary factors that I'm going to be monitoring:
1. Fuel mileage - I get about 9. 5 MPG towing on a route from Houston to Fredericksburg in the Texas Hill Country with the DD2's (10-10. 5 MPG with stock injectors). I'll be comparing mileage with the TAG over the same route.
2. Turbo instability - at full throttle conditions such as those I mentioned above, I have a "whoomp whoomp" aerodynamic noise coming from the turbo area. I'm pretty well convinced that it's due to turbulent airflow to the turbo caused by the 180* bend in the inlet tube. If so, the TAG should make a marked difference.
3. Smoke - with the EZ on setting #2 and the DD2 injectors, I can make some pretty good smoke from off-boost conditions. I'll be watching to see if this changes due to the claimed quicker spoolup.
From an engineering perspective, honeycomb flow straighteners have been used in wind tunnels, process piping, etc. for many years, so it's proven technology. The benefit it will provide in our application just depends how turbulent the inlet air is at the mouth of the turbocharger compressor impeller. If it makes a difference, I'll say so. If it doesn't, I'll also say so.
Rusty