i was wondering does going from 2.25in to 2.5 inch exhaust piping without making the transisiton smooth make a car sound more raspy? like for example you weld a 2.5in inlet muffler on a 2.25in stock exhaust system without having some piece of pipe that converts the pipe size smoothly, would it sound raspyer because of the abrubt change in pipe diameter?

 

I personally have around 2.25" piping on my car and I have a 2.5" inlet muffler. The place where I went used the pressure bending machine with a flaring attachment to flare it to 2.5" pretty much where it met the muffler. Doesn't sound any more raspy than it did when I had my old piping. Don't know how it would be on a 4th gen, but in my 2nd gen there was no problem

 

The y-pipe is what adds rasp.

If you just went 2.5 on an otherwise stock system it would just be deeper.

 

the y pipe made the rasp

 

i have some minor work done to my max and the y-pipe i have has a 2.5in outlet!!!i also have 2.25in straight piping from the y-pipe to the muffler
(no cats or resonators).
should i do 2.5in all the way back straight pipe?????

 

a catback is 2.5".

 

so are you suggesting to do 2.5in?