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I’ll be doing an alignment when I get back to no sales tax Oregon and also go to Costco to see what they say about tread warranty or new tires or to rotate and balance.
They let me walk under the ioniq when it was on the lift at Firestone though. And wow. The underside is actually extremely flat and flush. Seems like making it perfectly smooth will barely make a measurable difference for fuel economy. Only non aero sections would be cat convert and exhaust section and then maybe the small gap around the flat underside muffler. Seems like just building a longer diffuser at the end would still work extremely well
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