Fuel System:

Return Style (Regulator)

Returnless (OEM GM) - FPCM with -6AN FP sensor included

Sending in ECM for reprogramming?(required):

No

Yes (2017+ E92)

Sending in TCM for reprogramming?(required):

No

Yes (T87A)

Yes (T93)

Add MAF Sensor?:

No

LT MAF only

LT MAF with bung

Add O2 Sensors?:

No

Yes, front only

Yes (emissions - front/rear set)

Add NSS?:

No

10L NSSNeutral Safety Switch for 10 speed automatics to prevent the vehicle from starting in gear.

Gear Ratio/Tire(required):

Emissions Wiring(required):

None

Purge Only

Post CAT O2s & Purge Canister

Post CAT O2s/Purge/Fuel Tank Press./EVAP Vent (Cali Emissions)

Transmission Generation:

1st Gen 10L (.300" OD Trans Lever Shaft)

2nd Gen 10L (.335" OD Trans Lever Shaft)

Front End Drive(required):

Examples are Holley, Wegner, CVF Racing, Drive Junky, etc.

10L Tap Shifter(required):

No

Yes, add 10L floor shifter with Reverse/Tap CAN relay

LT4/10 Speed Harness only