also nothing wrong with oem intake or many other parts of oem design. but like most people its good to add some shiney to under the bonnet and upgrade the rail isnt a bad thing to do either as its better to hold more fuel across the rail. the point is cj are a trader. its not some bullshit chineese ebay seller. and despite what others who rnt a buyers opinion is, this product should do its job and it doesnt! the reason its purchsed is errelevant imo! the fact that we belive a trader on the site would test a product to its fullest befor production isnt an unreasonable assumtion to make. you buy a product off ricky AdDaMan? you ask for stress tests? crack and pressure tests? airflow charts?? no because he is an APPROVED trader and you shouldnt have too!!