The thing I dislike most about a Nascar build is if the kit comes with a molded in exhaust system on the frame, it has to be removed. That is the way this old Johan kit came. Below are the steps I took to remove the exhaust.
First I got out the sprue cutter.
Then I got out the #11 exacto.
Then I got out the bigger exacto (don't know the number).
The I got out the sanding stick with various sanding belts.
Then I glued some styrene on the back of the holes caused by the removal of the mufflers.
Then I puttied the voids where the mufflers were.
I sanded the putty and primed the frame this afternoon. I will try to get pictures soon of the results.