2.5" pipe to 2.25" Muffler Inlet

[ACHTUNG]

I'll be putting on a custom exhaust for my 325i in the next few weeks. I'm planning to go with long tube headers that come to a 2.5" Y which feed into a single 2.5" pipe, 2.5" universal high flow cat. From there I was wondering what muffler to get. Would I defeat this set up if I used a 2.5" to 2.25" reducer to a 2.25" inlet muffler? Or should I go with a 2.5" inlet muffler?

[doucy2]

2.5 inlet to 3" out :D

[fretburnr]

i'm wondering the same thing. it makes muffler choice easy, that's a given... but wondering if that minute restriction right before the muffler opens up will make any difference on a (mostly) stock m20.

[ACHTUNG]

i'm wondering the same thing. it makes muffler choice easy, that's a given... but wondering if that minute restriction right before the muffler opens up will make any difference on a (mostly) stock m20.

That's exactly what I was thinking. I know it must make some difference but do you think it makes a noticable difference?

[NOMAD]

your smallest size in the system is essentially the max size for your whole exhaust. Why don't you just get a 2.5 coupler and call it a day? I'm sure the power level will not be effected much but why not do it right?

It just seems like a waste to do all that other work, why not just get a 2.25" system...

[JRKOUPE]

pipes

I run a 2.5 single...utilizing magnaflow cat and borla can.....all 2.5.


IIRC there are several 2.5 mufflers....why go 2.25 if you dont need too....

that being said I doubt it would make a big diff to end w/ 2.25

[ACHTUNG]

I run a 2.5 single...utilizing magnaflow cat and borla can.....all 2.5.


IIRC there are several 2.5 mufflers....why go 2.25 if you dont need too....

Which Borla do you have?

[JRKOUPE]

Muff

Ill check my receipt......................but IIRC its the 14" turbo universaL.2.5 IN /OUT.

its the 40653.......center /offset......





There are so many brands, as you know. It depends on what brand , price point, size, etc that you prefer. I wanted on the loud side, well made and didnt mind spending up to 100.......but many brands can be had for 50 ish... check out Summit, Jegs, Performance peddler...

[Bav///Motorworks]

i just had a Y section made after the cats to a single 2.25 piping to a 40series flowmaster. sounds sick


o yea, never mind my signature, i don't drive an es anymore, i now drive the same color but a IS

[JRKOUPE]

i just had a Y section made after the cats to a single 2.25 piping to a 40series flowmaster. sounds sick


o yea, never mind my signature, i don't drive an es anymore, i now drive the same color but a IS

where in NY???

....Id like 2 hear a flowmaster....Im 1 hr N of NYC

[Bav///Motorworks]

is somers upstate? i'm on long island. about 30 min from the city, around 44 of the LIE


edit. o i just mapquest somers from where i live, 1hr away

[JRKOUPE]

is somers upstate? i'm on long island. about 30 min from the city, around 44 of the LIE


edit. o i just mapquest somers from where i live, 1hr away

I am down for hooking up.........let me know good days for you. Starbucks on me!!!! I always wanted to hear a FM...I run 2.5 system w/ borla....and jus did header.




halfway.in yonkers?......whatever.

[Bav///Motorworks]

if u can come down at nites thats fine with me, i'll pm u with contact info

[fretburnr]

take a sound clip, we'd love to hear it