Custom b pipe - best to match bore size of current system which is at what size?

[p1tse]

Just had a reply back from a reputable custom exhaust place with the following

"We can build a centre section in stainless with no silencer for £150 including fitting, Vat and lifetime warranty. It would be best to match the bore size of the existing system really, you will only really benefit from increased bore size if you do the whole cat-back system. You will not be able to make the car louder without some increase in noise inside the cabin."

Is this a good price and comments about bore size?

 

[Benneh]

I'm not sure on price as it's nothing I've ever looked into, but they are correct about the bore size. An increase in inner diameter will create a greater volume allowing for an increase in flow, producing more power. However, if you introduce different size bores in a single system you start entering the scenario where you can create back pressures, which is not good for engines. So I'd say their advice is spot on! xthumbup

 

[p1tse]

What size is the current bore on oem system?

What got me thinking about this option is wocka youtube clip but at 2.5" bore size I think?

 

[Gordyitrdc5]

iirc i think oem bore size is 60mm or to 2.5" hope that helps.

 

[wocka]

Yep mine is 2.5" and works great with oem backbox

Regarding price im not sure as i know my local exhaust guy well as ive been going to him for around 6 years but i paid £80, not sure what he would charge normally...... He even picked my car up and dropped it back off at work for me, guys a legend and would recomend him to anyone who wishes to travel to stafford

 

[p1tse]

Thanks

I understand the basics on not going too large, on principles of air velocity and volume combination, but I liked the sound of wocka at 2.5" but I'm sure I've seen some off the shelf at 2" or 2.25" so wanted to know what the oem is

I guess price wise its cheaper than a supersprint and more expensive than a mild steel sportex so probably about right

I'll see how things fair in 2015 and also keep an eye out for aftermarket options if they did come up

How would a unsilenced b pipe on oem setup sound versus mugen?

 

[DanM]

Price seems reasonable for the centre section. I paid £300 for a custom 2.5 inch system - straight through 2.5 inch centre and 4 inch cobra back box. I paid an extra £60 to fit a PLM 4-2-1 and sports CAT - he made the sports CAT section with me providing the magnaflow CAT.

It is very quiet at 60mph but loudish when I put my foot down - perfect for me as a 250bhp daily

 

[FireDance]

£150 seems about the right price

These are the ones on CTRO that are designed for the EP3:

http://civictype-r.co.uk/forum/viewtopic.php?f=124&t=276840

Price:

Unsilenced B Pipe and Donut Gasket (DIRECT Replacement) = £155.00
Silenced B Pipe and Donut Gasket (DIRECT Replacement) = £175.00

Delivery £15.00

 

[p1tse]

FireDance, thanks. Think price is about right then.
I've just never gone down custom exhuast route, as I've always gone down to a "branded" route; thinking it's had some R&D.

Will see how things go in 2015. that's almost half the funding for some used branded exhuast back boxes and b pipe.

 

[FireDance]

keep your eye on the parts for sale section, you might grap a bargain

 

[p1tse]

keep your eye on the parts for sale section, you might grap a bargain

I will not mod has gone out of the window lol
but the plan was always a bit more noise front and back

We shall see, but main aim is to enjoy and keep the car in tip top condition

 

[Crazylegs]

As per above, you're probably best waiting for a Spoon B pipe.

More expensive of course but genuine JDM.

 

[p1tse]

As per above, you're probably best waiting for a Spoon B pipe.

More expensive of course but genuine JDM.

i'm not looking for crazy sounds but something a bit more over stock. Spoon B pipe is silenced though so with a oem back box, I don't think will add much more.
But yeah JDM points would be good

 

[beppe786]

im thinking of changing my mugen twinloop b pipe to a custom 2.5in as the mugen mid pipe is very skinny.. also thinking of taking the middle silencer out.

what are your thoughts ?

 

[Gareth88]

Having the same thoughts myself, just undecided about the silencer

 

[beppe786]

Having the same thoughts myself, just undecided about the silencer

the mugen backbox piping is 2.5in don't know why they kept the b pipe so skinny.. maybe to help low down torque

 

[Gareth88]

Me either =/ I've been thinking about it for sometime but there's something in the back of my head that's saying " it's mugen designed... Is it done for a reason? " ha

 

[MrRy]

Me either =/ I've been thinking about it for sometime but there's something in the back of my head that's saying " it's mugen designed... Is it done for a reason? " ha

it is annoying there isn't any hard information on this. Taken from Mugen themselves:

The ideal requirement for a performance exhaust system is, "low exhaust pressure." MUGEN has developed our own "Twin Loop Silencer" to satisfy this condition while accomplishing a high quality exhaust note. Recently considering a engine characteristics, complete combustion, MUGEN has been working hard to develop their expansion silencer, resonance silencer, and also deterioration-resistant sound absorption material to improve noise reduction, quality and durability.

MUGEN also applies such technologies to develop and adopt the optimum pipe diameter, layout, and silencer configuration, and finisher design. In addition development of the finisher along with its aerodynamic parts can surely create a sense of unity and balance to the rear of the car.


TWIN LOOP
Silencing characteristics and the quest for exhaust efficiency: the two requirements imposed on exhaust systems have a contrary relationship, and in practice it is extremely difficult to achieve both. At MUGEN, we have continued to employ the straight configuration, with the design philosophy that low exhaust pressure must be provided, and that reducing exhaust resistance is an important part of the ideal exhaust system.

The straight configuration is widely used in racing, and is ideal because, as the name suggests, it provides low exhaust resistance. As a result of our quest for the ideal design for racing engines, MUGEN developed the "twin-loop-layout silencer" (exhaust system), in which the pipe is twisted into two loops and passes straight through the silencer twice.

This could be considered the ultimate arrangement, combining the concepts of "absorption" and "intervention" in an ingenious manner. It surpasses normal systems in power and torque over the full range, and provides the required silencing and the clear sound.

Available for CIVIC TYPE R (EP3/EK9), INTEGRA TYPE R (DC5/DC2/DB8) etc.

 

[Gareth88]

Me either =/ I've been thinking about it for sometime but there's something in the back of my head that's saying " it's mugen designed... Is it done for a reason? " ha

 

[Gareth88]

Not sure why that posted twice! Yeah I have seen this page =/ hence some of my dubiousness.... The itch to test it still remains ha