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I just picked up an 02 Z06. Unfortunately, the original owner has forgotten most things he's done to the car over the years. He didn't skimp on any parts. It apparently got the Delco / Mongoose 440ZS package. The only search I can find leads to a dead website. From what I can find, this was a shop in Sarasota that did these upgrades. I'm hoping some people on here are familiar with those different packages and what they included.
If anybody is interested, from a wayback search I was able to find this info (of course their upgrade stages lol).
Delco/Mongoose Performance Packages
Stage I Power Pak 360+ Horsepower *
1997-98 LS1 Power Pak, Includes K&N Filter and Fuel Re-curve Vacuum Line
Stage II Delco/Mongoose 380 SS 380+ Horsepower *
Includes Stage I, Plus Ignition Timing Tricker, Throttle Body Coolant Bypass, 180 Degree Thermostat, Max Modified Air Flow Sensor (Exchange-Core Deposit Required of $125-), plus a Delco/Mongoose Performance Badge. NOTICE: Customers with a '97 or '98 should add an Adjustable Fuel Pressure Regulator, and a Fuel Re-curve Vacuum Line to achieve best results.
Stage III Delco/Mongoose 400 SS 400+Horsepower *
Includes Stages I & II, Plus Low Resistance Ignition System With Low Resistance Red Wires, Low Resistance Plugs, Aluminized Solid Steel Exhaust, (Other Exhaust Systems Available), Performance Badges.
Our Most Popular Package!
Stage IV Delco/Mongoose 425 SS 425+ Horsepower *
Includes stages I, II, III, Plus Long Tube Coated Headers, Custom Computer Programming, Max Air Intake System, Performance Badges.