Question about Muffler
#1
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Hi all,
I am new to this forum. Kindly help...
I have a question about stock muffler vs aftermarket replacement vs straight-thru replacement. I have a 2004 530i.
1) Is there really a big, obvious difference in power/performance with a straight-thru muffler compares to stock muffler?
2) I heard straight-thru mufflers increase the HP for 3-5%, is that really true and can the increase of HP be felt?
3) And is there any difference between a stock muffler vs any universal muffler replacement (non straight- thru)?
Thanks all in advance...
I am new to this forum. Kindly help...
I have a question about stock muffler vs aftermarket replacement vs straight-thru replacement. I have a 2004 530i.
1) Is there really a big, obvious difference in power/performance with a straight-thru muffler compares to stock muffler?
2) I heard straight-thru mufflers increase the HP for 3-5%, is that really true and can the increase of HP be felt?
3) And is there any difference between a stock muffler vs any universal muffler replacement (non straight- thru)?
Thanks all in advance...
#2
![Default](https://5series.net/forums/images/icons/icon1.gif)
Originally Posted by sho' post='517866' date='Jan 14 2008, 04:42 PM
Hi all,
I am new to this forum. Kindly help...
I have a question about stock muffler vs aftermarket replacement vs straight-thru replacement. I have a 2004 530i.
1) Is there really a big, obvious difference in power/performance with a straight-thru muffler compares to stock muffler?
No, the difference is not obvious or big, it does give slightly better throttle response and MPG if cautious.
2) I heard straight-thru mufflers increase the HP for 3-5%, is that really true and can the increase of HP be felt?
See no 1.
3) And is there any difference between a stock muffler vs any universal muffler replacement (non straight- thru)?
Weight
Sound
Looks
Performance
Materials
Of course this all depends on the manufacturer of the exhaust, those advantages also be disavantages depending on the company.Thanks all in advance...
I am new to this forum. Kindly help...
I have a question about stock muffler vs aftermarket replacement vs straight-thru replacement. I have a 2004 530i.
1) Is there really a big, obvious difference in power/performance with a straight-thru muffler compares to stock muffler?
No, the difference is not obvious or big, it does give slightly better throttle response and MPG if cautious.
2) I heard straight-thru mufflers increase the HP for 3-5%, is that really true and can the increase of HP be felt?
See no 1.
3) And is there any difference between a stock muffler vs any universal muffler replacement (non straight- thru)?
Weight
Sound
Looks
Performance
Materials
Of course this all depends on the manufacturer of the exhaust, those advantages also be disavantages depending on the company.Thanks all in advance...
#3
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Hi RemusExhaustShop,
Thanks for your fast response...
In response to your answer of 1) and 2), if the difference cannot be felt, why would many people want to upgrade?
And for 3), I understand upgrading to get a better look, weight and sound, but performance? since you state there is no big difference in performance in 1) and 2).
Just curious... Sorry for being stupid
.
Thanks!
Thanks for your fast response...
In response to your answer of 1) and 2), if the difference cannot be felt, why would many people want to upgrade?
And for 3), I understand upgrading to get a better look, weight and sound, but performance? since you state there is no big difference in performance in 1) and 2).
Just curious... Sorry for being stupid
![Tongue](https://5series.net/forums/images/smilies/imported/tongue.gif)
Thanks!
#4
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It is mainly a question of sound.
A certain group of owners would say the stock exhaust is somewhat too quiet and would like a little more grunt, with the added performance.
As for point 3, for example, on the 545i we dyno'ed a 9hp gain, which in itself cannot be overlooked, but it is not a dramatic performance increase.
I would say it highly depends on your application, some car models can really benefit from a straight through aftermarket muffler as the original setup is too restrictive.
In your case, the E60 5 series original system is somewhat heavy(2 silencers) and replacing with an aftermarket muffler will release trapped hp/tq.
A certain group of owners would say the stock exhaust is somewhat too quiet and would like a little more grunt, with the added performance.
As for point 3, for example, on the 545i we dyno'ed a 9hp gain, which in itself cannot be overlooked, but it is not a dramatic performance increase.
I would say it highly depends on your application, some car models can really benefit from a straight through aftermarket muffler as the original setup is too restrictive.
In your case, the E60 5 series original system is somewhat heavy(2 silencers) and replacing with an aftermarket muffler will release trapped hp/tq.
#5
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Originally Posted by RemusExhaustShop' post='517878' date='Jan 14 2008, 05:15 PM
It is mainly a question of sound.
A certain group of owners would say the stock exhaust is somewhat too quiet and would like a little more grunt, with the added performance.
As for point 3, for example, on the 545i we dyno'ed a 9hp gain, which in itself cannot be overlooked, but it is not a dramatic performance increase.
I would say it highly depends on your application, some car models can really benefit from a straight through aftermarket muffler as the original setup is too restrictive.
In your case, the E60 5 series original system is somewhat heavy(2 silencers) and replacing with an aftermarket muffler will release trapped hp/tq.
A certain group of owners would say the stock exhaust is somewhat too quiet and would like a little more grunt, with the added performance.
As for point 3, for example, on the 545i we dyno'ed a 9hp gain, which in itself cannot be overlooked, but it is not a dramatic performance increase.
I would say it highly depends on your application, some car models can really benefit from a straight through aftermarket muffler as the original setup is too restrictive.
In your case, the E60 5 series original system is somewhat heavy(2 silencers) and replacing with an aftermarket muffler will release trapped hp/tq.
I guess even replacing my somewhat heavy stock muffler, I would not really feel the difference in hp/tq as it is not obvious as you stated in 1) and 2).
Very much appreciated!
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