JWT = more noise - down side lots of heat soak, loss of bhp I had the JWT and then the typhoon, and then i modded the typhoon. I think if you can pick up a 2nd hand Typhoon system (as i did) its probably worth the extra over the JWT,but would struggle to justify a brand new K+N against a JWT. The K+N comes with a proper cold air feed,and i actually ran my JWT with the K+N air feed,though noticed no real difference. I wouldnt mind a JWT filter in a K+N style box. The JWT is alot bigger than the filter on the K+N, not sure if that alters things at all. I noticed that getting going after traffic with the pop charger,the car felt a little slower,cant say iv had the same situation so far with the K+N on. Which would you say was better the JWT or the K&N? My car came with a JWT pop charger,so iv never had a proper air box,but love the sound. It was just ever so slightly chaffing,and when under load etc,with the engine moving,it very slowly went through.(just above the hard plastic shroud that is there. I just took 5mm or so off that and also put abit of rubber trim on it to protect it some more. You will see what i mean when you offer the box up in the space. However,its the raw edge on right hand bottom corner that is abit tight with the wiring loom. Sorry,i refitted it all yesterday afternoon.