Here is the 1st video I took of the GT-37 after I got it running with the new Melling cam.
Stock 2" front exhaust pipes and Cherry Bomb turbo mufflers. No tail pipes. Ignition timing not set as of yet.
Click on the photo to start the video.
Here is the same igition timing with the new Pypes stainless steel Street Pro system with splitters,

Believe it or not it sounds even better now with the ignition timing more advanced now. It has a real nice hollow camming sound.

Click on the photo to start the video.
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1971 Pontiac GT-37
Car is a junk yard dog and maybe one day will be restored.