Designing my own NA exhaust - project.

[Kinsy]

If you want quiet just stick with the stock airbox and get a rolled tip Mongoose, it's not much louder than stock until you hit 5k+. I drove mine round for a couple of days like this and was stuggling to hear the exhaust.

Most of the noise comes from induction - definintely the boomy noise in the cabin!

[synXero]

I think you will struggle with space to build in two active outlets and two norms and two active ports will be extra heavy and extra complex.
A two tailpipe system with one silenced and one active (silencer by pass) would be much simpler?

That is essentially the current iteration of the design.

I've been looking into the internals of a silencer box, resonators and mufflers. Quite interesting how varying the proportion you used inside would change sound pitch. And emissions.

The active system needn't add much weight at all. Simple mechanical pieces can do the job, either electronically operated valves, or even more simply pressure operated valves.



That all said, the exhaust builders haven't seen this yet, so they may have quite a bit to say about it.

[Herts66]

Sounds great will look forward to seeing the results!

[CalMac]

SynXero

Hi mate I've got a custom box on mine, not sure how to post pictures yet but I'll figure it out in due course

I'm selling it now as I can't get enough of the Blitz Nurspec sound (one of which is currently on it's way, soon to be adapted for my N/A)

If you're interested I'd be more than happy to sell it to you, just pm me or comment back

Calum

[alan_uk]

my hks hi power exhaust single exit sounds awesome mate on my n/a you thought about 1 of those



looks the part too

[CalMac]

That does look nice Alan! Blitz is already en-route though

Just tried to upload links to pics of my exhaust but apparently I haven't posted enough yet lol

If anyone is interested I'm not looking for a fortune and I can send links directly

[synXero]

Going to get it all fitted on the 21st. Exciting. Certainly going to look different...

[CalMac]

good stuff, which design did you go for in the end?

[synXero]

It's going to be a quad exit. I know a lot of people think they look pretty bad but I'm hoping it works out. We've got it worked out that the silencer bypass valve can be worked in later on - but they cost a whopping £450 each, for a valve that is operated by remote control. For pressure activated valves you're looking at four figure sums.

[snotrag]

they cost a whopping £450 each, for a valve that is operated by remote control.

'exhaust dumpers' as theyre known in the USA, are a lot cheaper than that if I remember rightly. 2 min googling brings up - http://www.dmhperformance.com/ecutout.htm for instance.

Sure I've seen manually operated ones (boden cable?) for even less.

[synXero]

Fancy that.

The fella that's doing my exhaust had just built a set into his Audi S4. It sounded absolutely ferocious. I don't know if they were Rolex-spec valves or if he was just trying to deter me

[CalMac]

WOW. that does sound like a lot!

Definitely a nice feature to have though

[synXero]

Well, it got dropped off today. About Wednesday, I should be seeing some results...

I am very nervous. What if it all goes wonky?

[CalMac]

I'm looking forward to this!

[synXero]

I am getting progressively more nervous! I am certain it's going to take some getting used to either way. It will probably also really need some bodykit to get away with it... Oh well. I'll hang onto the stock back box for resale value definitely.

[CalMac]

The stock backbox is worth something?! I let it go with the CAT for £40

[synXero]

No no mate they're worth xxxx all! But for the resale value of the car.

[CalMac]

hahah I see!

[Donato]

Would this be of any use?

http://www.driftworks.com/qtp-electroni ... -pipe.html

[Donato]

Would this be of any use?

http://www.driftworks.com/qtp-electroni ... -pipe.html

Never mind. Scrap that, it looks pretty expensive haha