Mine is showing the slightest hints of bubbles at the moment and I believe it's just from the heat. I don't know if there's any way of preventing it and I recently installed Fast intentions and it has larger exhaust tips so hopefully that doesn't amplify the problem, but who knows. The heat will still get to the top of the diffuser, if you watch your car idle when it's cold out you'll notice the hot exhaust gases travel straight up and kind of fog up the rear bumper a little if it's just sitting still.
It most likely affects the edges faster which is why I'm assuming it's at the top and bottom but not near the center.
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AeroJacket Lip Kit | GTR switch | NISMO S-Knob | Blacked-Out-EVERYTHING| 5% Tint | Carbon Fangs/Upper Trim | VOSSEN CV3's | Painted Headlights | CF Diffuser
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