Back box / Resonator delete

Back box deletes and resonator deletes are handy when you don't want to break the bank to make some subtle changes to your car - in terms of noise, weight and exhaust flow. With the back box / resonator deleted, the exhaust is then unrestricted, meaning that your engine will flow the exhaust gasses more efficiently. This combined with a remap, you are typically going to gain more power and efficiency over a remap without this exhaust modification.