No it is not legal.
Yes and No. it depends on the year of your vehicle.
from the Texas DPS site
Aftermarket Air Intake Systems (AIS) and Thermostatic Air Cleaners (TAC)1996 and newer vehicles do not have a Thermostatic Air Cleaner (TAC) system. The TAC system went away on 1996 & newer vehicles, because these vehicles are equipped with OBDII (On-Board Diagnostics - Second Generation) computer systems and these vehicles have more sophisticated fuel injection systems and emissions control systems, so there's no need for a TAC system. There are several different brands of aftermarket open-type air filter/intake systems by K&N, Airaid, AEM, etc, so these are OK to install on any vehicle that did not come factory equipped with a TAC system and you will pass the visual emissions component inspection.NOTE: If the air intake system reads "For Racing Purposes Only" or "For Off Road Use Only" then it is not intended for use on public roadways and is not street legal. If the air intake system is CARB approved and 50-state legal, then it is street legal in all 50 states.
1995 and older vehicles that are equipped with a TAC system are required to have all the components in place in order to pass the visual emissions component inspection, which is part of the annual safety inspection. The TAC system consists of the enclosed air cleaner/filter assembly and a heat shroud at the exhaust manifold and then there is also a heat duct hose that connects from the heat shroud to the air cleaner assembly. Also, some of the TAC systems had a fresh air duct hose that attached from the front or side of the air cleaner assembly to either the front or side of the vehicle. The TAC system is a closed-type air cleaner/filter assembly and it was designed to reduce Hydrocarbon (HC) and Carbon Monoxide (CO) emissions during cold engine operation, so if your vehicle came equipped with a TAC system and if it was removed and replaced with an open-type design air filter/intake assembly, the vehicle will fail the visual emissions component inspection.
By installing an cold air intake on a mustang
A cold air intake will increase your horse power
Cold air intake is better because it's denser.
A cold air intake regulates the amount of cold air coming into a car and ensures the air is properly filtered.
A cold air intake is an aftermarket part used to help open air flow to the engine. The cold air intake sucks up cold air from underneath the car and is attached to your intake manifold. So it is a pipe going from somewhere close to the bottom of the engine compartment leading to your intake manifold.
You will not damage your engine if you remove its cold air intake. The cold air intake system is merely added to increase engine efficiency and performance.
I would recommend putting a cold air intake in your es.
Yes a cold air intake could be used in any car
A cold air intake brings air into the engine. It usually consists of a plastic tube with a air filter on the end.
Cold air intake kits are used for bringing relatively cool air into a car's internal - combustion engine. Cold air intake kits are also marketed with claims of increased engine efficiency and performance.
Cold air has more density than hot air.
If you mean cold air intake or cold air induction (CAI), the answer is no. A cold air intake system is simply a more free flowing air intake. The intake tubing is less restrictive, and often draws air in away from engine heat, hence the name cold air intake. This could be lower in the engine compartment by the fenderwall usually. A cold air intake will ultimately make the engine run slightly cooler. A cooler engine is less destructive to the various components. So CAI will not shorten the life of your engine when properly researched, installed and used.