Just search on ebay or aliexpress for an "electric exhaust cutout" and you'll find it, I went with a 2.25" option which fits the stock exhaust well. That said, I've destroeyed two cutout motors in 2 track days so since I've converted the cutout to be cable operated rather than electric. If you're starting fresh, I'd recommend a vacuum operated exhaust cutout, the electric one just seems to not like the heat from the exhaust if the car is driven on track.
