With my standard exhaust atm as doing other bits atm with the car and hate having things laying around unused lol. Only have had a small drive and the car revs much easier, feels a little bit quicker too. Highly recommended!! best 18 pounds ive spent on a car mod yet lol. Havent driven it properly yet as still stuck at work but im sure it even pops even with a standard exhaust on. Can anyone confirm this?? gonna get some mates to check it later for pops etc