I have some stage 4 jammers I am going to install this weekend do I need to change the copper washers out too,where I bought them they said I didnt need to

 

you might not have to..... but i would. just lessen the chance of having to redo a injector or 2 or 3 . just because the washers wont seat. and the washers are cheap compared to the dissapointment and hassel to redo them!

its a gamble your choice. somtimes they will work. and somtimes

 

thanks I went last knight and bought them just to be sure