I have a 1990 300zx TT . Currently the car has to what i believe an HKS dual honeycomb filter (was on the car when i bought it) The material is very similar to the cushioning youd find in a couch? Seems sketchy and very restricting? Has anybody else seen these? Planning on getting a K&N pop charger. Thoughts? Ive used K&N on all my v8's and never disappointed. First "import" car here... soo forgive my noob mistakes :)