muffler delete pipe size?

joe325i · 01-26-2012, 04:34 PM

so im doing just the muffler to satisfiy my needs for now. but i was thinking if the pipe from the resonator to the muffler is 3" and i lobbed off the muffler and ran 3" pipe wouldnt i lose some torque? what do you guys think of running say 2.5" as to pick up a little bit of back pressure?

kiwi29 · 01-26-2012, 04:39 PM

I'm currently runnign 3in from cat back, I notice a lot of backpressure lost on low end and torque but high end, its free flowing and sounds really nice

RupertPupkin · 01-26-2012, 04:50 PM

Mine was done right to the right of the driver's side control arm using 2.5 inch mandrel bent piping mated to a magnaflow y and out two tips. It has no noticeable loss of torque, and I love the tone. Wish There was a way to make it drone at 2000-2500k a little less. Otherwise tho it sounds great.

To be honest I haven't noticed any "losses" that people talk about. I have the Injen intake and this MD and the car if anything feels alot quicker. It definitely pulls harder up top. I feel like too many people are dyno queens.

joe325i · 01-26-2012, 04:58 PM

when i was an audi folk haha i had full straight 3" exhaust . i lost low end but when i put my magnaflow muffler on which was a staright threw type , i gained back my low end torque. i am going to put the same muffler on my 325 but not till winters done and gone. when its nice out i will do a catback deleting all nonsense back to my muffler. do you know the part number of the y piece?

RupertPupkin · 01-26-2012, 05:19 PM

I used this Y
http://www.magnaflow.com/02product/s...e=main&id=9817

Stainless and well built. 2.5 inlet, dual 2.25 outlet.

Needs some customizing as the tips sit too far apart if just mated to the Y

and Thermal R&D 3246 Stainless Double Wall Tips. The Y can be had for 25 on amazon, and the tips are very similar to the Dimisa tips. I happened to prefer the Thermal ones from an exhaust I had on a previous car. They were about $100.

I went this route because I dont like the way the dual tips most shops sell, and people use look. Where the are basically meeting the single at a 90degree angle. looks funky to me. My setup flows alot better I feel. Ill get around to taking pics some day.

01-26-2012, 04:34 PM	#1
joe325i Private 5 Rep 55 Posts Drives: sedona rot 135i Join Date: Nov 2011 Location: western mass iTrader: (0)	muffler delete pipe size? so im doing just the muffler to satisfiy my needs for now. but i was thinking if the pipe from the resonator to the muffler is 3" and i lobbed off the muffler and ran 3" pipe wouldnt i lose some torque? what do you guys think of running say 2.5" as to pick up a little bit of back pressure?
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01-26-2012, 04:50 PM	#3
RupertPupkin Major 92 Rep 1,456 Posts Drives: Freak Beast Join Date: Aug 2011 Location: East iTrader: (5)	Mine was done right to the right of the driver's side control arm using 2.5 inch mandrel bent piping mated to a magnaflow y and out two tips. It has no noticeable loss of torque, and I love the tone. Wish There was a way to make it drone at 2000-2500k a little less. Otherwise tho it sounds great. To be honest I haven't noticed any "losses" that people talk about. I have the Injen intake and this MD and the car if anything feels alot quicker. It definitely pulls harder up top. I feel like too many people are dyno queens.
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01-26-2012, 04:58 PM	#4
joe325i Private 5 Rep 55 Posts Drives: sedona rot 135i Join Date: Nov 2011 Location: western mass iTrader: (0)	when i was an audi folk haha i had full straight 3" exhaust . i lost low end but when i put my magnaflow muffler on which was a staright threw type , i gained back my low end torque. i am going to put the same muffler on my 325 but not till winters done and gone. when its nice out i will do a catback deleting all nonsense back to my muffler. do you know the part number of the y piece?
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01-26-2012, 05:19 PM	#5
RupertPupkin Major 92 Rep 1,456 Posts Drives: Freak Beast Join Date: Aug 2011 Location: East iTrader: (5)	I used this Y http://www.magnaflow.com/02product/s...e=main&id=9817 Stainless and well built. 2.5 inlet, dual 2.25 outlet. Needs some customizing as the tips sit too far apart if just mated to the Y and Thermal R&D 3246 Stainless Double Wall Tips. The Y can be had for 25 on amazon, and the tips are very similar to the Dimisa tips. I happened to prefer the Thermal ones from an exhaust I had on a previous car. They were about $100. I went this route because I dont like the way the dual tips most shops sell, and people use look. Where the are basically meeting the single at a 90degree angle. looks funky to me. My setup flows alot better I feel. Ill get around to taking pics some day.
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