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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 03-12-2014, 10:18 PM
japanrot325ci japanrot325ci is offline
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Location: Toronto
 
Join Date: Sep 2013
Posts: 45
Mein Auto: '04 325ci
does a "y" pipe cause restriction? is it bad?

been thinking about getting an exhaust for some tone. i have been on the magnaflow muffler side but i have a 325ci and it's a dual/dual 2.25'

the magnaflow i want is the magnaflow 14815, but this is a inlet/outlet2.25in./3in and singlet inlet therefore will need a "y" pipe before the muffler

my question is does a y pipe cause restriction? is it bad for the engine? lose any power?

or should i get a magnaflow 11378 which is a dual/dual 2.25 (will need to buy tip)
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  #2  
Old 03-13-2014, 05:30 AM
SPDSKTR SPDSKTR is offline
I'm a DlCK! So what?
Location: Birmingham, AL, USA
 
Join Date: Sep 2011
Posts: 1,980
Mein Auto: E30 with an S52
Think about this for a second. You're wanting to cram the gas of two 2.25" pipes into a single 2.25" opening. Keep thinking. Come on, man... I know you can do this...

"That's a lot of gas going into such a small pipe!"

There you go!

You're going to want a dual in, dual out muffler and pick the tips of your choosing. Alternately, you could do a single 3" exhaust (maybe 2.75" since it's an M54B25?) from the headers back and go from there. Granted, you'll lose a little bit down low, but in the higher RPM range, it'll really wake the car up.

Good luck!

Last edited by SPDSKTR; 03-13-2014 at 05:31 AM.
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  #3  
Old 03-13-2014, 06:37 PM
japanrot325ci japanrot325ci is offline
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Location: Toronto
 
Join Date: Sep 2013
Posts: 45
Mein Auto: '04 325ci
Quote:
Originally Posted by SPDSKTR View Post
Think about this for a second. You're wanting to cram the gas of two 2.25" pipes into a single 2.25" opening. Keep thinking. Come on, man... I know you can do this...

"That's a lot of gas going into such a small pipe!"

There you go!

You're going to want a dual in, dual out muffler and pick the tips of your choosing. Alternately, you could do a single 3" exhaust (maybe 2.75" since it's an M54B25?) from the headers back and go from there. Granted, you'll lose a little bit down low, but in the higher RPM range, it'll really wake the car up.

Good luck!
thanks! that really makes sense

hopefully the 11378 is as deep as the 14815
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  #4  
Old 03-14-2014, 06:30 AM
SPDSKTR SPDSKTR is offline
I'm a DlCK! So what?
Location: Birmingham, AL, USA
 
Join Date: Sep 2011
Posts: 1,980
Mein Auto: E30 with an S52
Go find yourself an AC Schnitzer muffler.
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