Attention: TDR Forum Junkies 
Here is a summary of my observations using the Quadzilla Towing Module. This is a simple pressure box, in-cab adjustable with 0-50-100 HP settings. Its fueing curve based entirely on boost, with a design objective of: (1) responsive but not punchy throttle to control EGTs, and to be easy on the stock turbocharger and (2) aggressive fueling into high RPMs. I decided to try one of these and report on my observations:
1. The fueling curve has met its objective. No actual dyno curve yet, although the butt dyno tells me that this box fuels very smoothly from 1800 to 3000. nice. I put my pressure fears aside temporarily and just enjoyed the box. It delivered.
2. EGTs are managable. I understand that Quadzilla has deliberately introduced a tiny bit of softening into the responsiveness of the fueling curve, which means when you punch it, you get very smooth application of power and a little EGT advantage. I haven't yet compared this with a Bullydog or EZ, but based on my observations I think Quadzilla was succesful in meeting this goal. Smoke is very light, and the truck is not jumpy by any means. Based on what I feel in the seat of my pants, the box performs exactly as intended.
3. With the box on high, I can floor it at 1800 RPM in 5th gear and take her to 70 mph before EGTs reach 1300. acceleration is smooth, predictable and strong. I have completely stock air syststem and turbocharger -- I bet this box would perform very well with intake and exhaust.
4. As with any simple pressure box, installation is simple: two connections to MAP and fuel pressure port. The Quadzilla comes with a three position toggle switch to select off, 50HP or 100HP settings. in-cab adjustability is very nice.
5. In general, I expect a pressure box to run cooler than the VA duration box, and this box does not disapoint. I get significantly more usable power out of it than I do with the VA.
I experimented with stacking the Quadzilla with the VA duration box. wow, was that ever a good idea. talk about area under the curve! Setting the VA duration box on its "Level 1" position gives you a good low end, a smooth torque curve, and good EGTs, but leaves you wanting a bit more oomph. However, with the addition of the Quadzilla on 50 HP, you get a very nice combination of:
1. low fuel pressure -- with the Quadzilla on 50HP, fuel pressure is within acceptable limits, in my opinion. keep in mind that I am conservative when it comes to pressure, so I prefer to keep the Quadilla on low.
2. reasonable EGTs. The Quadzilla by itself actaully runs cooler than than the VA, which is expected since duration without timing means net retardation of timing. I expect VA will fix that. But the combination of pressure and duration in this case produces a very nice power curve with managable EGTs.
3. The Quadzilla box by itself (on highest setting) has a very nice power curve in its own right. The VA just fattens up the low end.
4. The Quadzilla's power curve compliments the VA curve very well. While the Quadzilla is soft (compared to the VA) down low, it comes on strong at the upper end while the VA tapers off. nice.
conclusions:
1. if you are comfortable with elevated fuel pressures approaching 27,000 psi, this is actually a fine alternative to the VA duration box. It does not deliver near the low end torque of the VA, but that isn't all bad either. The Quadzilla fuels strong into the high RPMs, drives very nicely, and does very well in the EGT department.
2. I personally prefer a box that does not loudly announce its presence with a touchy throttle. The Quadzilla fulfils this better than the VA duration box, which is very nice in its own right. For mild, city driving you get a bit stronger launches with light throttle, but not eye-popping, smoke-making, turbo-busting fuel. When you punch it, you get a little smoke and a fueling curve that comes alive around 1800-1900 and doesn't stop.
3. The Quadzilla is a great stack for the VA duration box (personal experience). I bet it would also make a good stack for the TST, particularly because it would let the TST fuel down low, and it would kick in and cool things off at the upper end.
1. The fueling curve has met its objective. No actual dyno curve yet, although the butt dyno tells me that this box fuels very smoothly from 1800 to 3000. nice. I put my pressure fears aside temporarily and just enjoyed the box. It delivered.
2. EGTs are managable. I understand that Quadzilla has deliberately introduced a tiny bit of softening into the responsiveness of the fueling curve, which means when you punch it, you get very smooth application of power and a little EGT advantage. I haven't yet compared this with a Bullydog or EZ, but based on my observations I think Quadzilla was succesful in meeting this goal. Smoke is very light, and the truck is not jumpy by any means. Based on what I feel in the seat of my pants, the box performs exactly as intended.
3. With the box on high, I can floor it at 1800 RPM in 5th gear and take her to 70 mph before EGTs reach 1300. acceleration is smooth, predictable and strong. I have completely stock air syststem and turbocharger -- I bet this box would perform very well with intake and exhaust.
4. As with any simple pressure box, installation is simple: two connections to MAP and fuel pressure port. The Quadzilla comes with a three position toggle switch to select off, 50HP or 100HP settings. in-cab adjustability is very nice.
5. In general, I expect a pressure box to run cooler than the VA duration box, and this box does not disapoint. I get significantly more usable power out of it than I do with the VA.
I experimented with stacking the Quadzilla with the VA duration box. wow, was that ever a good idea. talk about area under the curve! Setting the VA duration box on its "Level 1" position gives you a good low end, a smooth torque curve, and good EGTs, but leaves you wanting a bit more oomph. However, with the addition of the Quadzilla on 50 HP, you get a very nice combination of:
1. low fuel pressure -- with the Quadzilla on 50HP, fuel pressure is within acceptable limits, in my opinion. keep in mind that I am conservative when it comes to pressure, so I prefer to keep the Quadilla on low.
2. reasonable EGTs. The Quadzilla by itself actaully runs cooler than than the VA, which is expected since duration without timing means net retardation of timing. I expect VA will fix that. But the combination of pressure and duration in this case produces a very nice power curve with managable EGTs.
3. The Quadzilla box by itself (on highest setting) has a very nice power curve in its own right. The VA just fattens up the low end.
4. The Quadzilla's power curve compliments the VA curve very well. While the Quadzilla is soft (compared to the VA) down low, it comes on strong at the upper end while the VA tapers off. nice.
conclusions:
1. if you are comfortable with elevated fuel pressures approaching 27,000 psi, this is actually a fine alternative to the VA duration box. It does not deliver near the low end torque of the VA, but that isn't all bad either. The Quadzilla fuels strong into the high RPMs, drives very nicely, and does very well in the EGT department.
2. I personally prefer a box that does not loudly announce its presence with a touchy throttle. The Quadzilla fulfils this better than the VA duration box, which is very nice in its own right. For mild, city driving you get a bit stronger launches with light throttle, but not eye-popping, smoke-making, turbo-busting fuel. When you punch it, you get a little smoke and a fueling curve that comes alive around 1800-1900 and doesn't stop.
3. The Quadzilla is a great stack for the VA duration box (personal experience). I bet it would also make a good stack for the TST, particularly because it would let the TST fuel down low, and it would kick in and cool things off at the upper end.
. Without validation, my thinking is that the pressure box will give some improvement, and the duration only box will not. A stacked combo will be somewhere in between.
Did not watch gauges - to busy hanging on. I have drove this combo hard - turbo still hanging in. 
