Rev9 Valved Side Muffler Bypass Pipe For Porsche 911 991 GT3 RS 911R 2014-2019 – Pair

Want to make your 991 Porsche 911 sound a little more aggressive?

These Rev9 valved side muffler bypass pipes are a solid mod.

They fit the 991 GT3, GT3 RS, and 911R from 2014 to 2019.

You get two pipes—one for each side—with valves, so you can control the flow and the noise.

Part number is CB-312.

Rev9 gives a 1-year warranty.

Important note: these are for off-road use only, so check your local laws before installing.

Also, California has the Prop 65 warning—so heads-up if you’re there.

If you want more volume and a sharper note from that flat-six, these bypass pipes deliver.