Modify stock exhaust boxes for more v8 burble?
 

There has been several different mods on here to give the 8 more of the lovely V8 burble.

What are peoples opinion on removing the stock exhaust, cut open the boxes(on the top so MOT people won't notice) remove all the extra stuff inside and re-route the piping inside if needed to get straight flow before welding it back together..

It sure would be cheap parts:)

No one?:)

Snap! I to have thought about doing this and I may have a go if I can get a S8 back box at a sensible price. But I'm not in an any rush and mot stations in the uk don't care anyway. I've put hole saws through DPF and cats before with excellent results. Not a mark on the outside!

I would suggest looking for a universal straight through exhaust box rather than cutting into your current one.

It will probably be cheaper and last longer than a modified version...

However, if you do chop into it, you'll need to use perforated sections of pipe for the inside to allow some of the sound to expand into the silencer box.

MG

Someone has already done this and documented it nicely with photos. I was searching for it when I found this. It may be on Audiworld.

Emptying stock boxes bad idea, it will drone badly
Had that done, hated it

Thanks for the reply !
Mine's a D3 - could make a difference - doubt it though.
I DO want to avoid the drone like the plague; and like the toothpaste-back-the-in-the-tube, I doubt it'd be easy to replace the stuffin' on those boxes!
but I still haven't found that thread... haven't been on much lately - no time to search...

Thanks so much again & Merry Christmas
Tom

It depends how the back box is made.
"Straight through" boxes use perforated pipes and still have sound deadening material in them.
Done properly, I don't see why it should drone...

Still, exhaust frequencies are a bit of a black art and manufacturers spend big $$ researching exhausts.

This is a very common modification on BMWs, this is the man you want to talk to:

https://www.facebook.com/Paulscarwelding/

http://www.exhaustmods.co.uk/

And I am convinced no one spends more than VWAG, my little Passat 1.8T sounds juuuust right, considering what it sounds like without an exhaust; and I've heard a lot of modified 1.8T exhausts, none of which I'd wish on an enemy... Do wish the turbo was audible though, but that's one thing the VWAG techs wanted to silence.

Can't get his site to work and I'm allergic to FB (but I might try later) Anyway, Thanks; I'm in the US but I will talk to him (on speakerphone so my kids can hear how our language is PROPERLY pronounced - as opposed to the friggin hillbillies' diction here) - Hell, it costs me over $10,000 a year to send them to private schools so they do not think "Tire" and "Fire" have only one syllable. But that's another story... People in the Southern US are borderline retarded. Just watch the "Top Gear" where they tour my part of the country (sic) I assure you the rock throwing and other idiocy is NOT staged.

God bless you every one, and merry ****in Christmas ya burks.

https://www.youtube.com/shared?ci=kja1W6J4YSk

https://www.youtube.com/user/paul6t96t96t96t9

PCW Exhaust Mods. Cool videos.
Ingenious business idea! +++

There was was a vid on YouTube showing the exact results. I do know that I had a straight through design rear box with an H-pipe and the drone was horrific. Worst at motorway speeds, which was very annoying.

It's quite a complex standard box. I would imagine partly to eliminate the drone.

http://http://up.picr.de/6214887ttk.jpg

He removed all the internal pipework, simplified it and fitted a tiny silencer on one side. This is the result:

https://youtu.be/vmTBmFLsGUY

A8freunde member Tennohund modified his exhaust by removing the H-pipe and putting straight through pipes (I think) through all the boxes.
He achieved a very nice sound (IMO).

I cant find the original post on A8freunde forum where he posted pictures of the modifications, but he has re-posted a picture on another forum.

http://www.motor-talk.de/forum/sport...55.html?page=2

There were several youtube videos with apparently no serious drone.
Only one video remains its been re-posted after the owner deleted the originals. This one does not show in cabin so can't judge for drone.

https://www.youtube.com/watch?v=vmTBmFLsGUY&t=21s

I copied the photo from the other forum for future reference in case the thread gets deleted.

http://forum.a8parts.co.uk/attachmen...1&d=1490355652

Ahh yes, Tennohund, I remember now. I did wonder where all his videos had gone. He showed some stills at the beginning of a video showing what the inside looked like.

It does sound great.