I don't think so, most are not that restrictive
If you removed ALL emissions equipment, the question would be hard to answer, in theory anyway. Removing individual equipment such as your Catalytic Converter would improve exahaust flow and improve gas mileage. Removing your Oxygen Sensor would most likely decrease gas mileage because the Oxygen Sensor helps control the air/fuel mixture.
The main purpose of a resonator is to reduce exhaust noise. Removing it will give the car exhaust a deeper sound.
a resonator restricts the sound in your exhaust. removing the resonator will give it a deeper sound. i would suggest changing the entire exhaust system and leaving he resonator off which would make a louder/meaner sound. leaving it on would silence the idle but when you rev it really high it would still be loud.
Posi?ætraction does not improve gas mileage nor does it decrease gas mileage. The traction does not come into play in less the pavement is wet.
Check out gmtnation.com, There are lots of helpful people there, lots of How-To Tutorials for the Trailblazer.
you wont gain any horsepower, you will just gain more noise
Depends on the vehicle. It could improve mileage or lower mileage.
A Helmholtz resonator intake system improves engine performance by reducing air turbulence and increasing air intake efficiency, resulting in better combustion and increased power output.
NO
no
ride a bike.
Yes.