What is the different between high and low impedance injectors ?

Price is almost same, delivered power is also same but what make them different ?

Is it really big deal (for exp. 300+ hp) to buy low or high imp injectors?

Thanks

 

Yes its very important that you use the same impedance as stock...but i cant remmeber whether stock are high or low imp

 

Do you remember what injectors did u buy ? or where ?

 

I bought ford 440cc injectors 42lb, i used to have bosch 310ccc injectors, 31lb?