wich muffler is better the s4 or the s5? im asking in terms of flow, sound, wieght, everthing. mine are really shitty (one is missing the tip and the other is halfway there) and so i went to the junkyard today to look for some stock replacements until i can buy a RB catback. I saw a set of s4 mufflers in good shape as well as a set of s5's. im leaning towards getting the s5's because they look bigger but also heavier. im gonna go back tomarow and get one set or the other just wanted to know what you guys thought/know about them. also will the s5 cans fit in my s4?

 

I don't know about the difference between S4 and S5 but according to my '89 FSM the turbo and the automatic have more capacity which I think equates to better flow.

 

well, the s5 is an auto so i guess thats good

 

doubt it would be a noticeable difference. get the set that is the least rusty hehe

 

If you are just getting mufflers..... just get the ones that are in better shape. I have no ideal about flow data, but, from the Y-pipe back, all stock systems have the same mounting points

 

The tips might be different. The S5 muffler tips might stick out farther if you put it on an S4 (unless you have S5 bumpers)