Electric exhaust cut outs

Corvettes have them stock. Guy was selling a pair for $60 at the last Fling I went to. OEM's have to be durable to survive the crap warranty now days. The Hellcats, Mustangs and Camaros all have them or something that makes them VERY loud when they downshift on the freeway, especially the Hellcats. IIRC the Model A had a manual cutout...at least the 3 stooges thought~