will the stock fual rail covers fit on an upgraded fuel rail? oh btw, its a 01 ls1. the fuel rails are the speed inc rails.

 

Most likely they will NOT just snap in place without some more modification.
The OE covers have a molded-in c-clip design on the back side that snap on to the stock fuel rail tubing size.
You may be able to slightly enlarge the 'C', but why would you want to 'hide' your new aftermarket fuel rails?

 

I'm not sure of the answer, however I'm curious why you'd want to hide aftermarket fuel rails...?

Also, nice FD!

 

thank you! i just like the way they look. figured it would help dress up the engine. and not that it is really possible, but i kinda like having people not know what is under the hood