all the cars iv had certed had to have a very tight hole where the pipes went through. like 5-10mm bigger diameter than the pipe, had to weld up multiple holes lol.
And the rules on what is structural have changed in the last couple of months so half the people who tell you they know online wont know what they're talking about too.
As above, see cert guy, but I know your car won't get a WOF if you cut anything around that front support panel, hell you can fail a WOF for chopping up a factory plastic bumper now (though it's fine to have an aftermarket front kit chopped up WTF).