Resonator Delete, lose backpressure = lose in lowend torque?

[hesios]

i'm installing stebro exhaust and i always thought axlebacks were real quiet to my ears

so thinking of removing resonator, did not want to change my OEM pipe

because i believe it's about 2in dual pipe , i didnt want it to get wider than that 2+2 =4

which also guy in my muffler shop told me to keep the pipe

well.. i'm left with the resonator..

but since i did think about muffler delete and run pipes went online and alot of people saying

removing resonator (this point ,scratch muffler delete because it 's not gonna happen tomy life anymore)
will lose backpressure which leads to lose lowend torque but bit more on high end

some say that some say resonator is just sound box that, this that, that

i really need facts, dynoes or unless u know what you are saying ,

please give me a good feedback since i'm installing stebro tmrw

will post you soundclips asap.

thanks have a good day

 

[T2FFN]

I found that difficult to follow entirely.

You should really give more info.

Which engine do you have?

 

[anderson]

when I parted my car out, I sold my intake and remus exhuast (when modded I had no resonator). I currently have oem exhaust with the resonator delete, no real diff in sound or performance with the resonator delete from stock. The low end torque loss will not come into play until you remove your backbox...unless you update your software (ess tuning is one option). Is your car pre 2006? If so, and you want your car to be loud throw some ebay headers (dyno proven for 10 hp) If you are lucky enough to find technic gen 3's (they yeild 25 hp dyno proven)and run straight pipes with software. btw pretty sure the oem pipe is 2.25

 

[Incompatible]

.... btw pretty sure the oem pipe is 2.25

I don't know about the pre-facelift cars, but my 07 Si oem exhaust has dual 1.880" (1 7/8") OD pipes from the resonators to the muffler.

I currently have oem exhaust with the resonator delete, no real diff in sound or performance with the resonator delete from stock.

This is something I am considering doing to mine as I'm looking for just a little more sound. Could you tell the difference in sound levels between the pre/post resonator delete? When you removed the resonators, did you go straight pipe replacement or add in an "H" tube? TIA and my apologies to the OP for the slight OT.

 

[anderson]

the sound diff is most noticeable when the car is started and standing at idle. I had a straight pipe welded in place of the resonator. I would suggest getting an intake, makes way more sound than the resonator delete under full throttle

 

[T2FFN]

Something like this?

http://cgi.ebay.com/ebaymotors/BMW-M54-E46-Z3-2-5L-3-0L-Z4-Stainless-Racing-Headers_W0QQcmdZViewItemQQ_trksidZp3286Q2em63Q2el1177QQhashZitem41496fcbe3QQitemZ280404937699QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

How much throatier does it make it? I crave more grumble and noise! :evil:

 

[cj10jeeper]

Not sure if it helps the thread but in the course of my quad conversion I removed the resonator. Having worked with the exhaust guys the decision was that the 6 cylinder did not need the balancing effect of it and it was nothing more than a form of aditional silencer and messed up the gas flow too. I did not add any balancer pipe as I have done on V8's which seem to require it more.

I cannot compare before and after because I went from a single 3.0i back box to twin OEM ///M boxes. The car certainly sounds better overall and while trying to avoid placebo effect it does feel better through the butt dyno.

Those headers look nice - Is the standard system so bad that it will benefit from these?

 

[Incompatible]

...Having worked with the exhaust guys the decision was that the 6 cylinder did not need the balancing effect of it and it was nothing more than a form of aditional silencer and messed up the gas flow too. I did not add any balancer pipe as I have done on V8's which seem to require it more.

CJ, Your conversion is a true dual system, two separate pipes from the exhaust manifolds back with no x/h/y pipes? Did you get a chance to look at the resonators when they came off? I would assume that they were straight throw flow and heavy?

 

[cj10jeeper]

True dual - manifold to tips.

Only one resonator and it's a small kidney shaped chamber. 2 pipes in and 2 out. Since I did not chop it up I cannot speak to the contents but assume it's an empty balancer, part silencer and as the name 'resonator' would imply to make a suitable exhaust note.

Here is the ///M version of it:

 

[Incompatible]

True dual - manifold to tips.

Thanks