ITG is known to have better airflow. they are the best for the clio and no doubt the megane. K&N are a halfords special, there good but not specialsed, the green range of filters are also great and cheaper than both, they have been proven to flow better than K&N. in fact K&N usually produce worst results and need cleaning oiling, the green just needs a 12k clean and the ITG never needs oiling or cleaning and allows for most airflow.
the standard airbox/airfeed/filter is designed so the car can run on dusty/sandy roads in hot countries its a decent design that will protect the engine. however in this country its damp and cool, running a custom air feed in a more direct place will allow for better ram air and a semi enclosed cone will give best sound/power results.
ive noticed biggest gain on the cup with the hillpower induction. instead of moving original feed i added a second feed to lower bumper. the noise on standard driving was unchanged but after half throttle or when you push down at low revs to force air in, it growls like fook and pulls better but curiously and noticebly when running BP ultimate, but it is a nice sound and rev`s free`er. i imagine you would benefit more from remapping after the feed + zorst has been done for better all round breathing.
basically all you need is to pass the MOT, so a sports cat at 100cell minimum, custom induction feed(removes silly noise regs airbox design and pumps out some serious sound) then you have a good starting point to map and add intercooler etc..
another long post :lol:
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