straight pipes or mufflers delete

Kream · 03-10-2009, 02:15 PM

Is running straight pipes or deleting the mufflers bad for our S54 engine? I was told by Muffin Muffler (silly name I know) that NA engines need back pressure else we will lose a lot of power. I was going to delete the muffler and drive it for a week or two before shelling out the money to do straight pipes w/ tips. What are yall thoughts on this?

Incompatible · 03-10-2009, 03:37 PM

Besides being loud enough to get you a ticket, you will loose power with a stock setup.

StickshiftFreak · 03-10-2009, 04:25 PM

I have muffler delete on my M Coupe, and I lost some hp down low, but top end is so much better! Especially with the ESS software.

Burt Reynolds · 03-10-2009, 04:32 PM

If you have a ESS tune, you probably did not lose it down low either. Without a tune, you probably did lose some low end torque.

Kream · 03-10-2009, 04:36 PM

I see, so it won't hurt the engine or anything? I'll probably unbolt the mufflers tonight.

Matjo · 03-10-2009, 04:55 PM

Looks like RPI is going to do a muffler delete "exhaust" that will not loose any power

Z4MCJJ · 03-10-2009, 05:30 PM

Quote:

Originally Posted by Matjo

Looks like RPI is going to do a muffler delete "exhaust" that will not loose any power

Really, do you have an update on this product?

nmulax · 03-10-2009, 05:58 PM

Quote:

Originally Posted by Z4MCJJ

Really, do you have an update on this product?

read this thread, and next time use the

Burt Reynolds · 03-10-2009, 06:19 PM

Yeah but I wonder if RPI will require software with their muffler delete to no lose power? I hope they can but they have been working on that muffler nearly 29 years

mpower03 · 03-10-2009, 06:47 PM

pushing 30!!! lol

Z4MCJJ · 03-10-2009, 07:43 PM

Quote:

Originally Posted by nmulax

read this thread, and next time use the

Yeah, yeah....I read that post daily...I was thinking something "hot-off-the-presses" type newws.....

Kream · 03-11-2009, 09:51 AM

Do yall think I can remove the muffler and run it as is without pushing too much heat under the car? Or do I need to pipe to the rear / down pipe?

MMMazing07 · 03-11-2009, 12:11 PM

Quote:

Originally Posted by Kream

Do yall think I can remove the muffler and run it as is without pushing too much heat under the car? Or do I need to pipe to the rear / down pipe?

you should be good. i had mine off for week and it was fine. it sounds pretty different from straight pipes. straight pipes tone it down a bit (just short of out of control) i wouldnt leave them off for long though.

Kream · 03-11-2009, 12:31 PM

Quote:

Originally Posted by MMMazing07

you should be good. i had mine off for week and it was fine. it sounds pretty different from straight pipes. straight pipes tone it down a bit (just short of out of control) i wouldnt leave them off for long though.

Thanks! Just wanted to see if I can tolerate the droning before I put straight pipes.

Dieter · 03-11-2009, 03:32 PM

Quote:

Originally Posted by Kream

Do yall think I can remove the muffler and run it as is without pushing too much heat under the car? Or do I need to pipe to the rear / down pipe?

why do you want to remove the muffler??

car is very fast already !
No need to run down the road with loud vehicle, annoy all the Neighbors and look like a teenage fool.
Really why would you even think of it ?

mpower03 · 03-11-2009, 06:39 PM

Quote:

Originally Posted by Dieter

why do you want to remove the muffler??

car is very fast already !
No need to run down the road with loud vehicle, annoy all the Neighbors and look like a teenage fool.
Really why would you even think of it ?

i believe he wants to get an idea of the sound because he wants to run straight pipes.

krnnerdboy · 03-11-2009, 06:45 PM

had the muffler delete done regardless of what others said...w/o a tune

I actually gained a car length with my friends 335i v3 100 oct tune...and now he beats me by only a car and a half. so top end gains are definitely there but so are the low end losses. I get nothing but compliments on the noise...almost tubi ferrari esque <--blasphemy, I know but it has that hollow throatiness that I am sooo addicted to. not to mention it only takes 10 min to replace the factory muffler

The__J__Factor · 03-11-2009, 07:53 PM

Yeah i doubt that running straight pipes would be bad performance wise. Mainly since back pressure is a big myth, but correctly sized pipes are still needed for proper exhaust scavaging to take place. And also because removing any restrictions and greater flow will help top end the rest can be tuned out.
I also think we could gain heaps more power with a properly designed race header. All the ones ive seen look like they have piss poor merge collectors which would just ruin any gains the header would have. If we could get some one to design one using some Burns collectors or similar quality that would be awesome.

Dieter · 03-11-2009, 08:08 PM

Quote:

Originally Posted by mpower03

i believe he wants to get an idea of the sound because he wants to run straight pipes.

Guess so.
I just have my Car to go from point A to B and if I need power I know I go ti.
I dont race or to any track, Im way to buys working and to 49 years....Im very relaxed

wyu177 · 03-11-2009, 10:00 PM

Quote:

Originally Posted by Kream

Do yall think I can remove the muffler and run it as is without pushing too much heat under the car? Or do I need to pipe to the rear / down pipe?

Maybe you could try doing something like this; seems popular amoung Subaru guys, but haven't heard of Z4m or M3s doing it:

http://www.youtube.com/watch?v=ihEWbW-gsjg

Z4MCJJ · 03-12-2009, 12:38 AM

Quote:

Originally Posted by wyu177

Maybe you could try doing something like this; seems popular amoung Subaru guys, but haven't heard of Z4m or M3s doing it:

http://www.youtube.com/watch?v=ihEWbW-gsjg

Would the BMW dealership be kewl with this mod when they service my M coupe??

Mikewarlover · 03-12-2009, 01:34 AM

looks like a cheap mod wondering how the sound is gonna be

03-10-2009, 02:15 PM	#1
Kream Private First Class 10 Rep 160 Posts Drives: 07 M Coupe, 11 GLK350 Join Date: Jan 2009 Location: Austin, TX iTrader: (2)	straight pipes or mufflers delete Is running straight pipes or deleting the mufflers bad for our S54 engine? I was told by Muffin Muffler (silly name I know) that NA engines need back pressure else we will lose a lot of power. I was going to delete the muffler and drive it for a week or two before shelling out the money to do straight pipes w/ tips. What are yall thoughts on this?
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03-10-2009, 03:37 PM	#2
Incompatible Major 55 Rep 1,224 Posts Drives: 07 AW Z4C 3.0Si Join Date: Aug 2007 Location: San Diego iTrader: (1)	Besides being loud enough to get you a ticket, you will loose power with a stock setup. __________________ If you can't take the time to teach a kid something good, someone will take the time to teach them something bad.
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03-10-2009, 04:25 PM	#3
StickshiftFreak New Member 0 Rep 5 Posts Drives: 2008 Z4 M Coupe Join Date: Feb 2009 Location: Phoenix, AZ iTrader: (0)	I have muffler delete on my M Coupe, and I lost some hp down low, but top end is so much better! Especially with the ESS software.
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03-10-2009, 04:32 PM	#4
Burt Reynolds Captain 53 Rep 689 Posts Drives: 2007 M Coupe Join Date: Mar 2008 Location: Windy City iTrader: (0)	If you have a ESS tune, you probably did not lose it down low either. Without a tune, you probably did lose some low end torque. __________________ 2007 M Coupe w/NAV/Premium/Extended Leather, Clearbra, DICE, 4.10 BMW Motorsport Polished LSD, Active Autowerke Gen IV Headers, Supersprint Race Exhaust and X-Pipe, ESS Tuned DME, KWV3 Coilovers, Volk RE30, OEM Strut Tower Brace, Short Antenna, JL AMP, JL 10W7, Valentine V1.
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03-10-2009, 04:36 PM	#5
Kream Private First Class 10 Rep 160 Posts Drives: 07 M Coupe, 11 GLK350 Join Date: Jan 2009 Location: Austin, TX iTrader: (2)	I see, so it won't hurt the engine or anything? I'll probably unbolt the mufflers tonight.
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03-10-2009, 04:55 PM	#6
Matjo Private First Class 17 Rep 146 Posts Drives: Z4 M Coupé Join Date: Mar 2008 Location: Sweden iTrader: (0)	Looks like RPI is going to do a muffler delete "exhaust" that will not loose any power
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03-10-2009, 06:19 PM	#9
Burt Reynolds Captain 53 Rep 689 Posts Drives: 2007 M Coupe Join Date: Mar 2008 Location: Windy City iTrader: (0)	Yeah but I wonder if RPI will require software with their muffler delete to no lose power? I hope they can but they have been working on that muffler nearly 29 years __________________ 2007 M Coupe w/NAV/Premium/Extended Leather, Clearbra, DICE, 4.10 BMW Motorsport Polished LSD, Active Autowerke Gen IV Headers, Supersprint Race Exhaust and X-Pipe, ESS Tuned DME, KWV3 Coilovers, Volk RE30, OEM Strut Tower Brace, Short Antenna, JL AMP, JL 10W7, Valentine V1.
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03-10-2009, 06:47 PM	#10
mpower03 Captain 39 Rep 962 Posts Drives: 08 z4 M Coupe Join Date: Sep 2008 Location: FL iTrader: (2)	pushing 30!!! lol __________________
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03-11-2009, 09:51 AM	#12
Kream Private First Class 10 Rep 160 Posts Drives: 07 M Coupe, 11 GLK350 Join Date: Jan 2009 Location: Austin, TX iTrader: (2)	Do yall think I can remove the muffler and run it as is without pushing too much heat under the car? Or do I need to pipe to the rear / down pipe?
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03-11-2009, 06:45 PM	#17
krnnerdboy Colonel 190 Rep 2,431 Posts Drives: v10 m6 Join Date: Nov 2008 Location: so cal iTrader: (10)	had the muffler delete done regardless of what others said...w/o a tune I actually gained a car length with my friends 335i v3 100 oct tune...and now he beats me by only a car and a half. so top end gains are definitely there but so are the low end losses. I get nothing but compliments on the noise...almost tubi ferrari esque <--blasphemy, I know but it has that hollow throatiness that I am sooo addicted to. not to mention it only takes 10 min to replace the factory muffler __________________ F80 m3, 997 gt3, 14 ram ctd, f15 x5, drz400sm Gone:z4m, boss 302, c6 z06, m6,z3m
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03-11-2009, 07:53 PM	#18
The__J__Factor Major 88 Rep 1,090 Posts Drives: ///M Coupe Join Date: Sep 2008 Location: Gold Coast, Australia iTrader: (0)	Yeah i doubt that running straight pipes would be bad performance wise. Mainly since back pressure is a big myth, but correctly sized pipes are still needed for proper exhaust scavaging to take place. And also because removing any restrictions and greater flow will help top end the rest can be tuned out. I also think we could gain heaps more power with a properly designed race header. All the ones ive seen look like they have piss poor merge collectors which would just ruin any gains the header would have. If we could get some one to design one using some Burns collectors or similar quality that would be awesome. __________________ 135i N54 manual MR-S with a 2zz swap and mods Sold EVO X MR - Phantom Black - Ti Exhaust - Ti UICP - AQM Intake - Sold Z4 M Coupe - H&R - RE Diablo - RPi - Tekarbon - Sold
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03-12-2009, 01:34 AM	#22
Mikewarlover Major 40 Rep 1,165 Posts Drives: white Join Date: Oct 2007 Location: Richmond BC iTrader: (0)	looks like a cheap mod wondering how the sound is gonna be __________________ Modified CDV/Rogue Engineer Short Shifter/ RE Diablo Exhaust/ Matte Black Grill/Lighted ZHP shiftknob/Stubby Antenna / 19inch gunmetal Neez Super Euro Cross on Michelin
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