Your vehicle's ECU controls your injectors as a set. So if they are imbalanced at all, you will have some cylinders that are flowing slightly rich and some flowing slightly lean. The closer they are, the less waste the system creates. So, the closer the flow-match that you have the better mpgs you will get.
All of our sets are dynamic flow matched to the OEM factory standard of 3-5% of each other during our standard remanufacturing process. This does not come with documentation of the flow results. We offer advanced 0-2% flow matching which does include documentation. This is an add on that you can receive for $80 for the entire set (up to 8 injectors).
The percentages are how closely the injectors are flow matched to one another. The closer that the injectors flow to one another, the more precise the entire fuel system will be which makes it more efficient. This improved efficiency manifests as better fuel mileage and a smoother engine. As far as which option is correct, the choice is entirely up to the customer based on their individual needs and budget.
All orders are shipped within 1-2 business days from when payment is received.
Transit time varies based on service type requested:
First Class Mail: 3-7 business days
Priority Mail: 2-3 business days
Express Mail: 1-2 business days
Free Shipping options are generally First Class Mail.
For international shipments, make sure your address information is accurate. CS Performance assumes no liability once package leaves the United States. Please be sure your country is accepting packages from the US and you are aware of any duties or taxes your country may require upon package arrival.
Core Returns are completely optional and not required. When you order a set of fuel injectors from us, eligible part numbers will have a paper slip inside the shipping box. This paper slip will have all of the additional information regarding the return of your old cores for a varying price (depending on the part number you are looking to send in).
If your old cores are not eligible to be returned, you will not receive this paper slip within the shipping box, and no further action is required.
Thank you for your time and business, we appreciate it greatly!