The GT4 sounds great but a little more throaty sound is even better. This modification deletes the over axle pipe's gas particulate (GPF or OPF). Replacing this with a straight pipe allows better flow and better throatier sound. Add an exhaust valve controller and full ope it sounds amazing. This is a must do mod on your 718 4.0 if you think it doesn't sound as good as the 3.8 engine from the 981 Boxters and Caymans.

This is a definite DIY job, only 8 fasters hold each of the the pipes on.

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