Dave, the P.i. is a performance Inprover concentrate.
Reduces port injector deposits, intake valve deposits & combustion chamber deposits. $8.70 per 12 oz bottle.
It was reformulated last year and is recommended to use only one bottle/20 gallons every 4,000 miles.
http://www.amsoil.com/storefront/api.aspx
or
http://www.reykurassociatesinc.com/c....I.Performance Improver.pdf
You can order online or
APR Tuning in Lebanon is picking up my product line this week. They should have it in stock by Tuesday.
AMSOIL P.i. is the most potent gasoline additive available today. As a concentrated detergent, it is unsurpassed in cleaning combustion chamber deposits, intake valve deposits and port fuel injector deposits. AMSOIL P.i. helps maintain peak engine efficiency, fuel economy, power and drivability in newer low mileage engines. In engines with accumulated deposits, testing showed AMSOIL P.i. provided the following clean-up benefits after only one tank of gasoline:
Improves fuel mileage an average of 2.3% and up to 5.7%
Reduced emissions
hydrocarbons (HC) up to 15%
carbon monoxide (CO) up to 26%
nitrous oxides (NOx) up to 17%
Restored power and performance
Reduced need for costly higher octane fuel
Reduced noise from carbon rap and pre-ignition
Better drivability
Smoother operation
AMSOIL P.i. works as an emissions passer. It is ideal for use prior to emissions inspections.