Now with the exhaust is different , I didn’t go with Chinese brand like what I’ve got now and FYI I didn’t have that install it was from previous owner , it’s still loud but I don’t like it as it didn’t sit very well. With genuine Nissan’s exhaust yea it’s good but it’s not loud enough like how I want it. So I go with HKS , it’s loud enough than the current. Now questions - do I need to re-tuned the car with the new exhaust ? What about the horse Power , would it impact ?