Exhaust systems are one of the first modifications people make with their cars and as such there is great variation in options available and just as many opinions of which is best. With this in mind we bring you a test of several of HPF’s more popular exhaust combinations back to back on a 6.2l LS3 powered VE HSV. This is the first time Horsepower Factory have done a back to back comparison like this and the results were definitely surprising. Plus, with Rob running through the exhaust systems and the variations in components there is plenty of tech content for those with a thirst for knowledge!