This video should give you a good understanding as to how different the Porsche Sport exhaust & the regular exhaust sound like from in cabin. I placed the mic behind the GoPro head strap so it should closely match the sound you're hearing in reality.

You might want to wear headphones to get an even closer match.

Normal - Valves closed (Should be close to regular exhaust)
Sport - Valves opened, snappy shifts
Sport Plus - Valves opened, snappy shifts, revving to max