Its 2" and it seems to be okay... my TB is only 2.5" so its not to much restriction
Bernoulli equation says you might be suffering more than you think you are.
-The air in your intake is incompressible
-Pressure at the TB inlet is approximately 50 psi
-Pressure at the inlet to your snorkel is 14.7 psi (atmospheric)
-Inlet velocity for the air is 10 ft/s (this value doesn't really matter for the answer--it's an arbitrary value)
If the OEM diamater is 2.5", then the area is 4.909 in^2
If your snorkel diameter is 2", then the area is 3.142 in^2
The OEM inlet would get about 4230 CFM
Your snorkel gets about 2700 CFM, a reduction of about 40%.
That doesn't translate to a 40% reduction in power, but it doesn't really help. It's like your engine is sucking air through a normal straw instead of a McDonalds milkshake straw. It's just a little difference in size, but it makes a pretty big difference. Food for thought
March 2014 GCOTM. 1998 Deep Slate 5.9
On the Jeep:Hot intake, 52mm TB, Summit 8mm wires, catch can, 703s, insulated fuel rails, indexed Champions, Bilstein 4600s, Eibach lowering springs, Moog SS, Ironman mounts, Lotek 2GP, lots of gauges, sparkly paint.
In the garage: M1 4bbl
In the works: Addco/Hellwig sway bars, nitrous, full polly bushings, full exhaust, data logging, billet UD pulleys