As already explained, M&T does not admit by major. They do not care. You do not even declare the engineering major until the end of first year and you can change after that too. Many do not end up declaring what they applied as. It will not help you at all to apply with interest in ChemE vs Meam vs CIS. Penn has zero problems filling all the Engineering majors with the rest of the Seas students, and they do not have caps or quotas or any of that. They just fill the total Engineering spots(400ish) and the total M&T(50 I believe). ChemE(more accurately CBE there) is popular, but it varies greatly year to year and its popularity on the app is not a factor because so many declare differently once they get an idea of what each entails. More important may be your backup school to M&T(Wharton or Seas): it will need to be clear on your app why that one is the primary school of interest. Since dual applicants are able to list a single-school backup, there is no downside to trying for the dual.
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