Quote:
Originally Posted by SomeGeoffGuy
I think there is a minimum requirement to prevent melting the fascia. That is why you see the Cadillacs and even Silverado now have a metal insert in the fascia/bumper with a black exhaust pipe inserted inside.
-Geoff
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In the case of 4.5" tips, I could buy that, but the ZL1 has the same bumper as the SS and uses 4" tips that nowhere touch the bumper and just fill out the rear better. However that could be the reason they went with 3.5" for the SS; to give the ZL1 a further upgrade over it.