I/H/E on Blazer...MPG

Im thinking about buying a 2000 Blazer 4x4.I know GM doesnt build there engines very effeciant when it comes to Exhaust design and intake etc.

What MPG gain does everybody get with aftermarket Intake/Header/Exhaust.Being less restrictive you should free up alot of HP as get better Gas milage correct?

Also whats the CR on the 2000 4.3?

Thanks

Maximum, 2-3mpg.

Do the muffler and the intake, forget the headers.

Stock headers flow very well for this engine.