The Superformance Chassis Number is assigned by Superformance and stamped directly on the frame. The "Car Number" is the shorthand Chassis Number identifier for each car. The Chassis serial number is located on the VIN plate on top of the passenger foot well as viewed from the engine compartment
The Superformance Chassis Number exists in one of these three formats:
1. AC9CSLK1897AM1***. a 17 digit format with the xxx (the LAST 3 digits) being the spf chassis number . these existed on cars 032 thru 577 as well as 579, 580, 582,583, 584 and 586.
2. SP***, a 5 digit format. used on cars 578, 581, 585, 587, 588, 589 and 590. the last 3 digits being the chassis number.
3. SPO****, a 7 digit form. used on cars 591 and newer, the last digits being the chassis number.
The asterisks (*) are the Car Number you are looking for that vary from car to car. Even if your VIN number fits this format, it may not be not be your chassis number. The only accurate way to determine the Superformance Chassis Number is as follows.
Locating the Superformance Chassis Number and confirmation other than by the VIN tag:
A.) Open the hood. Look in from the driver's side.
B.) Locate the upper front cross member. It is just in front of the engine. For reference, it typically has the remote
oil filter mounted on it.
C.) On the top of the cross member about two inches from the left (driver's side) upright, a number is stamped directly on the frame cross member. This is the Superformance Chassis Number.
The number may also be written in grease pencil in the hinge plate, but use the stamped number.
The number is on every hinge on the car. Hood hinge plates, trunk hinge plates are the easiest. The rollbar is stamped too, down near its mounting points.
The chassis number for 541 is AC9CSLK1399AM1541. The 10th and 11th digits
"99" mean that the car was built in 1999.