Not sure if you're implying that there could be some sound difference with the combined PPK and PE but will it make a huge difference? Yes.
Will you notice the PPK more with the exhaust? Very doubtful.
Will it be "LOUD?" Nope.
No manufacturer is going to put out an exhaust that is truly loud for the people that really want to be noticed. They are still mass producing street parts and have decibel limits that they must adhere to to keep everything copacetic. If you want loud you'll have to step up to catless DPs and likely a muffler delete option. Then you'll be shaking walls =)
Jet Black 2012 BMW 135i E88 / M Sport Package / DCT / BMW PPK Stage 1 / Scopione Front Splitters and Rear Diffuser