[Nick]

Fitted a hks filter today,but have a few "isssues"
1, When you put your foot flat the engine seems to choke and run lumpy then when revs get to bout 3k it bursts into life.
2, When driving along maybe half acelerator you get a strange whooping noise and whoshing from the filter when u lift off the gas. Sounds strange and concerning.

Do i need to remap to acomodate the filter?
is this normal to get the noise?
should i just stick to stock filter as i dont have any major mods?
would i be better off with a panel filter instead?

Any tips/help apreciated