How much is it for a muffler delete?

I had my exhaust replaced there, it was around $400. I think they will do what you want, they charged me $75 to add a removable section in the exhaust later.

They do, I had my done a week ago for 80

I can say that replacing my muffler for a different one of the same size that I provided was ~$100. So replacing yours with a piece of straight pipe is probably the same price, maybe a bit more if you have to buy the pipe from them.

I dont believe they delete mufflers