How many ponies do people think you loose per exhaust box? Mine is too loud and am contemplating adding another box or two to take some of the edge off but don't want to be loosing lots of power. I've heard mixed reviews on how much you loose per box. Cheers in advance

 

Multiple boxes

TX.

 

It just has the one box at the back so just want to add another but font want to change the whole system.

 

Just change the back box.

 

do you mean changing the backbox, or adding more resonators?

 

i dont want to change the back box! i just want a simple answer to my fairly simple question. ive been told that the bhp loss is as little as 1 bhp but is there any thruth in that?

 

What's to say your going to lose power by adding a box in your system . As Matty says easiest thing to do is change your backbox
I have just changed from a fully decatted afterburner vortex to a 3' jap system With a sports cat & the car feels more responsive. Similarly people have changed from a sports cat to a blitz nur spec r and actually lost power. Speak to any recognized mapper and they will tell you that loudness does not equal power. Sometimes adding a resonator to a straight through system can actually aid back pressure in the system.

 

Simplest answer......

Change the back box to something quieter.

Resonator boxes are a ball ache and will not quieten the exhaust by much. As for losing BHP, you probably won't lose any but if you did the loss would be so small you would never notice it.

 

Resonator boxes usually just quieten the drone for decatted systems within the cabin. I had a non-resonated Cobra Race Tube and that was bloody loud in the cabin for drone. Was only a catback running on a standard downpipe! Then went to a system with an actual backbox on it with a resonated centre section and decat downpipe. Was quieter all round,more so in the cabin and the noise just comes out the back As it should.

Simple solution is get a resonator put into your centre section, simple chop out, weld in job. This shouldn't lose you any kind of power but will quieten it down at least inside when driving.

Andy

 

LOL typical Burnley talk

As said buddy, the best bet is to change the backbox, if you like the look of your backbox whatever that maybe then adding a resonator may help, but its not the answer in my opinion.

starting with loud in my experience:

1. Blitz
2. Jap Speed
3. eBay sh!te
4. Miltek
5. Cobra
6. Cant recall my current one but it very quiet

 

Thanks rob for that! Thought We stick together us lanashire lads! It's a one piece hns system fully decatted and 3" and I like the look of it and the sound of it, ie the note and the rumble etc, basically just wanted to turn the volume **** down a bit. Adding a box in the middle would do the trick for me and that's what I'll do, I just wanted people's opinions on weather I'd loose bhp with adding a box. I think the topic has been covered. Thanks chaps.

 

See that exhaust fella on Billington Ind Est buddy, he definitely sort it! He has done work on mine in the past ( sticking together )

Hope this helps

Rob

 

Thats my mate who has the shop who says you loose maximum 1 bhp per box. Just wondered what other people's opinions were.

 

I'd be very surprised if you lost any power by fitting a resonator box mate.

 

Theres a place in St.Helens,BCS he will put on what ever you need/ask
for.Co-owner is Nigel used to be co-owner of Blueflame.I was going
to go de-cat 3" straight through system accept for the noise,but Dave
the fitter cut my sports cat pipe back till it measured 3".Then fitted the new
peice of exhaust to fit the remainder of my original PPP 2.5" exhaust.I can now
add whatever i want in 3" when and if i decide to.It's another option.Their work is excellent and Dave the fitter is first class.A lot of the RS lads use him.

 

Shame then that increasing back pressure is not good for a turbo ... It's good for NA not turbos.

 

But having no back pressure at all is still not good for a turbo.Think about it , when the cars leave the factory they come with a std exhaust system.This is due to :1. economy 2. Emissions 3.Practicallity 4.Cost & lifespan.To much back pressure is not good for a turbo ,which is why when i inserted the bung in my afterburner vortex and drove it off boost the car ran like a normally aspirated car.As soon as you put your foot down on boost it ran s***e.
But the right amount of back pressure will allow a turbo to work to its true potential.