# Well, I think you are partially correct.....

Posted by Mikey P (93 SE) on June 18, 2002 at 07:38:24:

In Reply to: Think about it..... posted by Mike N on June 18, 2002 at 01:25:36:

: That 2.5" piping then meets with a 2" inlet muffler.. that larger diameter piping becomes worthless and basically the exhaust cat back isnt going to do its job effiecently.

With a muffler of less than 2 1/2, the exhaust may not be at maximum efficiency, but I wouldn't say doing it is worthless. Replacing the y pipe and the cat was the biggest gain I felt on my car even with the stock muffler and B-pipe. If the larger b-pipe with small muffler would be worthless then the y-pipe should be worthles by the same logic.

I just replaced my stock b-pipe and muffler with 2 1/2 inch pipe and a 2000 muffler. Even though the 2000 muffler is less than 2 1/2 I can definitely notice a slight gain. I think it is a mater of capacity. Under acceleration exhaust pressure increases and having the capacity to absorb an increase in pressure. There are a number of issues to consider in exhaust including exhaust pulses and all sorts of things. I'm certainly no expert in the matter but I know that each change to my exhaust has yielded some benefit even with a muffler that is slightly smaller than the rest of the system. I might be able to squeeze out a bit more with a 2 1/2 muffler but I am super happy with the tone of the car right now. It has a nice sound without being obnoxious.

Replys:

- yah, but it really depends on how the muffler was installed.. .. Mike N (89 Gxe) 15:26:49 6/18/2002 (2)
  - So, Mikey, how did you get the muffler installed? Smooth transition or a wall? n/m Aaron (92 SE Auto) 22:27:13 6/18/2002 (1)
    - something inbetween the two extreems :) n/m Mikey P (93 SE) 08:02:49 6/19/2002 (0)

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: : That 2.5" piping then meets with a 2" inlet muffler.. that larger diameter piping becomes worthless and basically the exhaust cat back isnt going to do its job effiecently. : With a muffler of less than 2 1/2, the exhaust may not be at maximum efficiency, but I wouldn't say doing it is worthless. Replacing the y pipe and the cat was the biggest gain I felt on my car even with the stock muffler and B-pipe. If the larger b-pipe with small muffler would be worthless then the y-pipe should be worthles by the same logic. : I just replaced my stock b-pipe and muffler with 2 1/2 inch pipe and a 2000 muffler. Even though the 2000 muffler is less than 2 1/2 I can definitely notice a slight gain. I think it is a mater of capacity. Under acceleration exhaust pressure increases and having the capacity to absorb an increase in pressure. There are a number of issues to consider in exhaust including exhaust pulses and all sorts of things. I'm certainly no expert in the matter but I know that each change to my exhaust has yielded some benefit even with a muffler that is slightly smaller than the rest of the system. I might be able to squeeze out a bit more with a 2 1/2 muffler but I am super happy with the tone of the car right now. It has a nice sound without being obnoxious.