If you have a good functional belly pan you don't need an airdam. The belly pan also has several other benefits. It helps the engine warm up faster hold the heat which in turn can be like a WAI.
Airdams are tricky and can create more drag then without. I tried 2 airdams and with on the road testing with a SG had a decrese in FE.
So I say grill block belly pan. YMMV
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