Back pressure?

BenõrTheBMW · 08-30-2013, 02:32 PM

Hey guys I recently went with a magnaflow 14815 and a resonator delete and I feel down on power. Could this be because I'm not getting enough back pressure?

Amini77 · 08-30-2013, 09:19 PM

Exactly. You loose low end torque. I'm thinking of putting my resonator back on and just keeping the Remus on but I love the sound of my exhaust right now.

BenõrTheBMW · 08-31-2013, 02:27 PM

Would an X pipe help gain back pressure ?

carlos916 · 08-31-2013, 03:02 PM

i dont get how a resonator will cause loss of back pressure if BPE doesn't have a resonator? i think it might be something else?

Mike. · 08-31-2013, 09:44 PM

could be a placebo effect because the car sounds like youre going faster, yet isnt actually going faster.

Route 16 · 08-31-2013, 10:20 PM

Delete your 2nd cats, improve exhaust flow, either have a shop bend the pipe missing section or buy a pipe with a j-bend and cut that (vibrant j-bend should be $30 I think) http://vibrantperformance.com/catalo...1022_1065_1115
For people who might have trouble having a shop make a y-pipe, magnaflow y-pipe (connect 2ndary pipe to resonatory pipe) http://www.amazon.com/Magnaflow-1076.../dp/B000COWU52

Back pressure for you, placebo effect, I've gone through 5 exhaust systems (eisenmann, big pipe custom straight, oem size straight pipe, all the same) Just have to live with the sucky throttle response. I am hoping for Vishnu to have the N52 Open Flash Tablet flash/tuning to be available for us. Go crazy with sound and exhaust systems you want now, then later get dyno tuning so DD is better later.

Eagle1oh7 · 08-31-2013, 10:48 PM

Seems like a lot of guys here just throw money at mods and then don't do dynos to follow up on any actual improvements.

carlos916 · 09-01-2013, 02:05 AM

Quote:

Originally Posted by Eagle1oh7

Seems like a lot of guys here just throw money at mods and then don't do dynos to follow up on any actual improvements.

http://www.e90post.com/forums/showth...ght=Cat+delete.

Eagle1oh7 · 09-01-2013, 12:39 PM

Quote:

Originally Posted by carlos916

http://www.e90post.com/forums/showth...ght=Cat+delete.

At least one person did the right thing.

cuiter23 · 09-01-2013, 02:14 PM

Quote:

Originally Posted by BenõrTheBMW

Would an X pipe help gain back pressure ?

Why would you want to increase back pressure? The whole point of having an exhaust is to minimize back pressure.

gingerbreadman · 09-01-2013, 02:36 PM

Quote:

Originally Posted by BenõrTheBMW

Hey guys I recently went with a magnaflow 14815 and a resonator delete and I feel down on power. Could this be because I'm not getting enough back pressure?

I have the same exact muffler on my car with no cat deletes and at first i was thinking "wtf did i just do to my car?" it felt remarkably slower but after driving it for about a month or so and the car fully adapted, it was over. it drove better than it ever did and was very responsive. just drive it and let it adapt naturally and it'll be fine.

ashmostro · 09-01-2013, 03:14 PM

Precisely

BenõrTheBMW · 09-03-2013, 10:46 AM

Quote:

Originally Posted by gingerbreadman

Quote:

Originally Posted by BenrTheBMW

Hey guys I recently went with a magnaflow 14815 and a resonator delete and I feel down on power. Could this be because I'm not getting enough back pressure?

I have the same exact muffler on my car with no cat deletes and at first i was thinking "wtf did i just do to my car?" it felt remarkably slower but after driving it for about a month or so and the car fully adapted, it was over. it drove better than it ever did and was very responsive. just drive it and let it adapt naturally and it'll be fine.

Sweet! It's a great looking muffler but I was freaking out when I first went to get it put on an they said it was not possible to fit it

bimmerquick43321 · 09-05-2013, 04:11 PM

my experience with my last car(non bmw) when removed the cat:
- low end torque improved (I thought it would be the contrary as "less back pressure" right?)
- mid rage got really bad
- didn't see much of a difference in the higher rpms

I had no tune, so with a tune it would probably have been another story, all I know is that if I'm not getting the car tuned, all stock cats will stay on and I would be willing to bet that I would be faster than someone who removed them.

gingerbreadman · 09-05-2013, 08:58 PM

Quote:

Originally Posted by BenõrTheBMW

Sweet! It's a great looking muffler but I was freaking out when I first went to get it put on an they said it was not possible to fit it

They probably didn't know what they were talking about or were too lazy to figure it out. Did they do it or did you take it somewhere else?

BenõrTheBMW · 09-06-2013, 11:20 AM

They fit it !

Eddien123 · 09-08-2013, 11:53 AM

Quote:

Originally Posted by BenrTheBMW

Would an X pipe help gain back pressure ?

An x pipe would give you the power back yes. It's a bit pricey for just a pipe.

08-30-2013, 02:32 PM	#1
BenõrTheBMW Second Lieutenant 35 Rep 280 Posts Drives: 2009 135i Join Date: Feb 2012 Location: Plano,TX iTrader: (1)	Back pressure? Hey guys I recently went with a magnaflow 14815 and a resonator delete and I feel down on power. Could this be because I'm not getting enough back pressure? __________________ 2009 E82 135i 6MT FBO
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08-30-2013, 09:19 PM	#2
Amini77 Brigadier General 188 Rep 4,732 Posts Drives: Alpine White '13 550i Join Date: Nov 2011 Location: Tarzana, CA iTrader: (1) Garage List 2013 BMW 550i [0.00]	Exactly. You loose low end torque. I'm thinking of putting my resonator back on and just keeping the Remus on but I love the sound of my exhaust right now.
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08-31-2013, 02:27 PM	#3
BenõrTheBMW Second Lieutenant 35 Rep 280 Posts Drives: 2009 135i Join Date: Feb 2012 Location: Plano,TX iTrader: (1)	Would an X pipe help gain back pressure ? __________________ 2009 E82 135i 6MT FBO
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08-31-2013, 03:02 PM	#4
carlos916 Semper Fi 23 Rep 417 Posts Drives: E60 ///M5 Join Date: Dec 2010 Location: Sacramento iTrader: (1) Garage List 2008 E92 328i [5.00]	i dont get how a resonator will cause loss of back pressure if BPE doesn't have a resonator? i think it might be something else? __________________
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08-31-2013, 09:44 PM	#5
Mike. Mike: Everyone's Pal 2045 Rep 2,972 Posts Drives: F80 M3 Join Date: May 2013 Location: Eastern Long Island iTrader: (5) Garage List 2013 BMW 335xi [10.00]	could be a placebo effect because the car sounds like youre going faster, yet isnt actually going faster. __________________ [CENTER] 2021 6.2L Trail Boss, 6" BDS lift, Chevy Performance intake, 35" Nitto Grapplers, 20" Fuel wheels
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08-31-2013, 10:20 PM	#6
Route 16 I got lei'd 846 Rep 7,594 Posts Drives: '10 E90 M3 Join Date: Sep 2011 Location: Dark Side of the Moon iTrader: (62)	Delete your 2nd cats, improve exhaust flow, either have a shop bend the pipe missing section or buy a pipe with a j-bend and cut that (vibrant j-bend should be $30 I think) http://vibrantperformance.com/catalo...1022_1065_1115 For people who might have trouble having a shop make a y-pipe, magnaflow y-pipe (connect 2ndary pipe to resonatory pipe) http://www.amazon.com/Magnaflow-1076.../dp/B000COWU52 Back pressure for you, placebo effect, I've gone through 5 exhaust systems (eisenmann, big pipe custom straight, oem size straight pipe, all the same) Just have to live with the sucky throttle response. I am hoping for Vishnu to have the N52 Open Flash Tablet flash/tuning to be available for us. Go crazy with sound and exhaust systems you want now, then later get dyno tuning so DD is better later.
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08-31-2013, 10:48 PM	#7
Eagle1oh7 Lieutenant Colonel 288 Rep 1,710 Posts Drives: '11 328i Sedan Join Date: Oct 2012 Location: Chula Vista CA iTrader: (0)	Seems like a lot of guys here just throw money at mods and then don't do dynos to follow up on any actual improvements. __________________ DONE: Seibon CF Hood, M3 Rep, MSport rear w/DD CF Diffuser, M3 Rep Skirts, Seibon CSL trunklid, Forgestar F14 18s w/Michelin PSS, Eisenmann catback, AA Headers, BPC Stage 2, Charcoal Delete+revMotor+AFE Drop In filter FUTURE MODS: LED headlights, CF rooftop, M3 Suspension Conversion, Dinan CAI Mod
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09-01-2013, 03:14 PM	#12
ashmostro Brigadier General 1254 Rep 4,088 Posts Drives: 2020 M4cs \| 2022 M550i Join Date: Jan 2013 Location: Falls Church, VA iTrader: (27)	Precisely
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09-05-2013, 04:11 PM	#14
bimmerquick43321 Lieutenant 81 Rep 525 Posts Drives: e90 330i Join Date: Feb 2013 Location: Montreal, Canada iTrader: (0)	my experience with my last car(non bmw) when removed the cat: - low end torque improved (I thought it would be the contrary as "less back pressure" right?) - mid rage got really bad - didn't see much of a difference in the higher rpms I had no tune, so with a tune it would probably have been another story, all I know is that if I'm not getting the car tuned, all stock cats will stay on and I would be willing to bet that I would be faster than someone who removed them.
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09-06-2013, 11:20 AM	#16
BenõrTheBMW Second Lieutenant 35 Rep 280 Posts Drives: 2009 135i Join Date: Feb 2012 Location: Plano,TX iTrader: (1)	They fit it ! __________________ 2009 E82 135i 6MT FBO
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