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Callaway (big bucks) and Lingenfelter(don't know about the cut but assume) cut the bottom of the box and added a green filter, lately, Lignefelter has gone to a Rotofab. I think Hennesy used to offer green filter in stock box, they only offer blower builds now. the 750 HP version still uses the stock box, I'm pretty sure they used say "green filter". I'm not supporting these companies I'm just saying what the big $$$$ shops are actually putting into the car.
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Forged short block, large duration sub .600 lift Cam Motion cam, 7200 RPM fuel cut, Pray Ported Heads, 3.85 pulley D1X, stage II intercooler, DSX secondary low side, DSX E85 sensor, Lingenfelter big bore 2.0 pump, ported front cats, 60608 Borla, LT4 injectors, ZL1 1LE driveshaft and Katech ported TB, ported MSD intake, BTR valvetrain, ARP studs, ProFlow valves, PS4 tires.
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