I realized WHY I didn't remove the wipers on my Impala. If you put the wipers in the up position and have a two piece cowel, you DO NOT have to remove the wipers. Whoever updates the How-to might want to add this.

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2004 Impala SS - ZZP PCM, 3.4" Pulley, K&N CAI, TOG Headers, SLP Cat-Back, 180* thermo, Autolite 605s, PRJ Performance wires, Alternator rewire, GMPP Handling kit
2000 Grand Prix GT, Commuter Car - K&N CAI, GMPP Handling kit, ZZP downpipe w/U-bend delete, ZZP Plog, Alternator rewire