Hey mate, good to hear you went for the upgrade. Bet you didnt realise Wales would cost you so much. Great choice though and it really makes the car. Best thing is the exhaust note just gets better and better over time.
I would advise keeping your 370 stock exhaust. When you come to sell/trade in the 370 you should swap the stock exhaust and sell on the invidia and not lose too much. it wont get you much payback when trading in the car.
Regarding the HFC's i loved it but found it a little too much for the car. Check out my youtube video to see the difference
As a separate aside - Tarmac did you ever get that exhaust video sorted, we are all still waiting to hear it