How do you get the 172cup interior engine soundtrack?

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Is it enough just to remove the boot lining and parcel shelf or is there more to it?
 
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The engine sound is more hollow, exciting and louder in the cabin in the 172cup. I just wondered if it's a simple matter of removal of the parcel tray and boot liner or is there more to it - lighter glass etc.
 
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The sound difference may be down to the different exhaust systems?

If you want loud:

replace the oem exhaust system + remove the cat
remove the rear seats and parcel shelf
remove the acoustic valve
 
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That is hilarious. The things people come up with these days never fails to amaze me but the fact that it is SOLD OUT!!!
 
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