That will probably not make any difference (so close to stock, it may even be a stock part on the newer cars). Maybe a nice aftermarket metal diverter valve would work, that's what I run in my 9-5. When you combine an aftermarket diverter with an open intake it sounds niiiiice .
Dammit I'm so new to Saab I don't know the first thing when it comes to this stuff lol. Still trying to find a JR drop in filter stateside, so far all I've found online (haven't looked a ton yet) is a company out of Britan I think. id just go with a K&N but I heard they can sometimes have a negative effect on the turbo Saabs