Stock exhaust with strait pipe

[240sx_in_209]

Can this be done? i have a friend that wants to do this. But i tell him he cant because the pipe is to big. he likes the way the stock exhaust looks but he wants it to sound a little meaner. I thought i cant be done because the strait pipe is 3' and the rest of the exhaust is no. Am i right or can it be done?

[seang]

Yeah, you can do that with a coupler if you want. I would stick with a 2.5 inch straightpipe, 3 is overkill.