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A 5" likely requires no cutting of the shroud whereas a 7" almost certain will so the install of the 5" if you're a DIYer is significantly easier.
That being said, from a performance standpoint, a 7" is a significant difference and what I would personally recommend. On my stock turbos with inlets and ethanol maps, the ETS 7" was JUST enough but I could've gone bigger imo; when custom tuning it was the next bottleneck after HPFP. I'm actually looking to sell it and get a 1000hp intercooler for my new power goals. PM me OP if you're interested in a used option
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"Wheels and exhaust aren't a build"
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