I ran a JDL UEL catless header and a Nameless high flow catted front pipe for 2 years of daily driving. With the windows up i never noticed a smell. Windows down there was very rarely some smell but only when the wind was blowing the right way and even then it wasn't a strong smell.
From a driving point of view i have gone back to stock exhaust and tune recently. I miss the extra poke they gave every day. I would say go catless header and a decent high flow catted front pipe for good gains and minimal smell.
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