Invidia calls them test pipes, but they are also called race pipes. Call them whatever, but know this: Putting these in place of your cats means one thing...power. Invidia also makes a high flow cat version to free up extra horsepower while remaining street legal. Invidia makes them from polished T304 stainless steel tube and welds on heavy duty flanges for perfect fitment. Test pipes are for off-road use only.
Invidia test pipes come in pairs.