well i have had the fuel pump cover off and i know that GM didn't leave much room for error..

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1. 400.4 Massive (comps)
1. 1500.1 Massive
1. 3000.1 Massive
1 18 Farad Massive Hybrid Capacitor
Stinger Wiring.
6 Massive cross overs 2 Massive DMX 12's sealed
Full Massive components/ Ecliplse avn 5510 HU

Soon to be adding
Massive Half DIN, 4 band parametric Equalizer.