no, I get it ...you just stated that you are going to put a big bore kit on it, and I just stated what I did .....and wish I would have done ....I just sold the one I posted ....now on the look out for another dcs6421 this one I will do the oem 52mm top just to see the difference the www.weedeaterman top end ran very strongIt is stock (oem), bought everything from Nate.