So I have finally decided on a Tuner- Monster Torque. I spoke to Rob from MT- seems a nice guy, happy to chat and discuss options. I am looking at 1000cc injectors, a Process West intercooler kit, a throttle body replacement elbow and a hi flow cat. He said it should produce somewhere around 300-315 rwkW. My only concern is the hi flow cat and extra noise. Can anyone that has had a hi flow cat installed tell me what the difference in sound is compared to the stock cat. The car is very quiet at the moment and I would like to keep it that way.