Power package level 4. Increase effiency, towing power, usability, and in some cases fuel economy. Roughly 450hp plus (up to 600hp) to the wheels!
Power increase - 300hp plus (can vary with timing)
Everything included in Level 1 and and level 3 (injectors and turob are upgraded from Level 3) plus :
THD Competition, custom 12mm injection pump (up to 32occ of fuel!)
Injectors - THD Comp 6x16 vco for 91.5-93. THD Comp 5x18 for 89-91.
Turbo - THD Compound 62sxe over an S475
DPC or Suncoast converter (if auto)
Valair Dual disc clutch (if manual).
Crazy Carl Intake horn (for i/c models)
Steed speed manifold kit
ARP Head Stud kit
Hamilton 165# valve springs
Hamilton 188/220 cam
Hamilton extreme duty push rods
Hamilton 1.45" tappets.