Would anyone be interested in having their back box modified?

2003 - 2009, roadster, coupe, facelift
Post Reply
User avatar
Ducklakeview
Lifer
Lifer
Posts: 4749
Joined: Tue Mar 22, 2016 4:08 pm
Location: Merseyside

Would anyone be interested in having their back box modified?

Post by Ducklakeview » Sun Jul 24, 2016 10:01 pm

As above. I've recently modded my own box, and I LOVE it, noisier, but not too noisy, with a DEEP burble, and just enough pops and bangs on the overrun.

See thread here; viewtopic.php?f=2&t=88783

I reckon this is a much better mod than a backbox delete, as all of those I had listened too were WAY too noisy, and in my opinion just sounded like an exhaust that had a hole in the pipe. That, and the possible performance losses from reduction in back pressure made up my mind to do this mod. I'm also convinced that my car actually now does feel a little bit more lively, not a lot but it's definitely there. I put this down to the fact that my box is now acting like a proper performance box, and (correctly) still giving some back pressure, but with improved flow due to the new pipework.

Externally, the box is unchanged, apart from a small section in the bottom, which needs cutting out for access when welding, this is seam welded back in, and all of the other work is done from the top of the box, and is therefore invisible. This should help come MOT time, as the "factory" silencer is still present. I also think this would help come resale time, as I can't imagine anyone preferring the "std" sound. This, is how the 3.0L should have sounded from the factory!

Video of before...


Video of modded box...




I reckon there is about 6 hours of work involved in modding the box, the first one took me a couple of days. I now have a box from a 3.0i pre facelift which I can modify and swap out on an exchange basis with anyone who wants to fit their own, I would supply quality fitting sleeves of the correct diameter. Alternatively, I would be happy to fit/swap the box FOC, which takes about 45 mins.

I can also offer this mod for other models, as the principle is the same, although I may need to order in different diameters of stainless tube and flexi if they aren't the same.

Price wise, I am looking at £275 on an exchange basis including delivery to you and the fitting sleeves, or fitted for free at mine. I would probably need an additional £100 pending return of the unmodded box, which would then be refunded, this would be in case a box was not returned, therefore breaking the chain, as another would have to be purchased to start again.

With a backbox delete alone ranging from £100-£200 alone from what I've read, I think this option is good value bearing in mind the amount of work involved in modding the box, and IMO it's a much superior solution..

Thoughts/questions anyone?

Mike

EDITED: To reflect increase of £25 due to extra costs, and exchange box deposit increase due to non-return of a box by member [ref]RickyG512[/ref]
Last edited by Ducklakeview on Wed Jan 11, 2017 10:51 am, edited 1 time in total.
Roof motor repairs/relocations and exhaust mods!
I can refurbish your VANOS and restore that mid-range grunt.
Contact me @ zed4mods@gmail.com

Tombstoneuk
Newbie
Newbie
Posts: 10
Joined: Mon Aug 25, 2014 9:22 pm

Would anyone be interested in having their back box modified?

Post by Tombstoneuk » Sun Jul 24, 2016 10:22 pm

I'd be very interested in this... Although I get married next month, so it would have to be Septemberish for me.

User avatar
Ducklakeview
Lifer
Lifer
Posts: 4749
Joined: Tue Mar 22, 2016 4:08 pm
Location: Merseyside

Would anyone be interested in having their back box modified?

Post by Ducklakeview » Sun Jul 24, 2016 10:30 pm

Tombstoneuk wrote:I'd be very interested in this... Although I get married next month, so it would have to be Septemberish for me.

No rush :D

Mike
Roof motor repairs/relocations and exhaust mods!
I can refurbish your VANOS and restore that mid-range grunt.
Contact me @ zed4mods@gmail.com

Tombstoneuk
Newbie
Newbie
Posts: 10
Joined: Mon Aug 25, 2014 9:22 pm

Would anyone be interested in having their back box modified?

Post by Tombstoneuk » Sun Jul 24, 2016 10:44 pm

But I want it!!! :rofl:

ChrisN53
Member
Member
Posts: 293
Joined: Tue May 26, 2015 9:59 pm

Would anyone be interested in having their back box modified?

Post by ChrisN53 » Sun Jul 24, 2016 10:57 pm

As mentioned in the other thread, I have the back box off my 3.0si already cut off and in my boot. Happy to be a guinea pig.

Conscious that shipping back and forth could be problematic/costly though?

SonnyA85
Member
Member
Posts: 382
Joined: Tue Apr 12, 2016 7:42 pm

Would anyone be interested in having their back box modified?

Post by SonnyA85 » Sun Jul 24, 2016 11:01 pm

Where are you based?

User avatar
Ducklakeview
Lifer
Lifer
Posts: 4749
Joined: Tue Mar 22, 2016 4:08 pm
Location: Merseyside

Would anyone be interested in having their back box modified?

Post by Ducklakeview » Sun Jul 24, 2016 11:12 pm

ChrisN53 wrote:As mentioned in the other thread, I have the back box off my 3.0si already cut off and in my boot. Happy to be a guinea pig.

Conscious that shipping back and forth could be problematic/costly though?
Shipping each way should be no more than £10. That's what it cost me to have my other box collected and delivered next day. I just had cardboard folded around it and lots of tape!

Happy to do this for you, but need to order some more stainless flexi and collars..

Mike
Last edited by Ducklakeview on Sun Jul 24, 2016 11:14 pm, edited 1 time in total.
Roof motor repairs/relocations and exhaust mods!
I can refurbish your VANOS and restore that mid-range grunt.
Contact me @ zed4mods@gmail.com

User avatar
Ducklakeview
Lifer
Lifer
Posts: 4749
Joined: Tue Mar 22, 2016 4:08 pm
Location: Merseyside

Would anyone be interested in having their back box modified?

Post by Ducklakeview » Sun Jul 24, 2016 11:13 pm

SonnyA85 wrote:Where are you based?
St Helens 5 mins from J7 of M62.

Mike
Roof motor repairs/relocations and exhaust mods!
I can refurbish your VANOS and restore that mid-range grunt.
Contact me @ zed4mods@gmail.com

SonnyA85
Member
Member
Posts: 382
Joined: Tue Apr 12, 2016 7:42 pm

Would anyone be interested in having their back box modified?

Post by SonnyA85 » Sun Jul 24, 2016 11:21 pm

Too far to make it worthwhile. If you ever come up to glasgow i would pay for a swap. Got a 3 litre e85

User avatar
Ducklakeview
Lifer
Lifer
Posts: 4749
Joined: Tue Mar 22, 2016 4:08 pm
Location: Merseyside

Would anyone be interested in having their back box modified?

Post by Ducklakeview » Sun Jul 24, 2016 11:55 pm

SonnyA85 wrote:Too far to make it worthwhile. If you ever come up to glasgow i would pay for a swap. Got a 3 litre e85
I could mod the one I have and send it to you, needing yours back once fitted, so car not off road?

If you are competent with the spanners it's a 30-45 min job with the sleeves I'd supply. Alternatively any exhaust place could swap it for you, in probably 30 mins or less.

Mike
Roof motor repairs/relocations and exhaust mods!
I can refurbish your VANOS and restore that mid-range grunt.
Contact me @ zed4mods@gmail.com

RickyG512
Member
Member
Posts: 57
Joined: Thu Jun 30, 2016 10:32 pm
Location: Heathrow/Kingston/Croydon

Would anyone be interested in having their back box modified?

Post by RickyG512 » Mon Jul 25, 2016 10:22 am

Super interested, might just go for this =)
Black 2003 E85 Z4 3.0i (newbie)

User avatar
Marlon
Moderator
Moderator
Posts: 8339
Joined: Mon Jan 05, 2015 11:13 am
Location: Lancs.
Contact:

Would anyone be interested in having their back box modified?

Post by Marlon » Mon Jul 25, 2016 10:35 am

This is very tempting Mike, I've looked at all kinds of back box options to release more sound from my 3.0si and your mod seems to tick all the boxes (excuse the pun :oops: )
You're close to me too (I'm in Preston).
Image
3.0si 2008 | Quantum Remap | CDV delete | M heated elec seats | M wheel
ZHP knob | Cruise | SB Hardtop | BMW 224 alloys | F30 tails | DLV back box

MACK
Senior Member
Senior Member
Posts: 2035
Joined: Mon Jun 15, 2015 11:38 am
Location: Manchester

Would anyone be interested in having their back box modified?

Post by MACK » Mon Jul 25, 2016 10:46 am

What is it like on a motorway/A road?
That would be my main concern the drone/noise level on a road trip rather than a blast through twisties or even using it on local urban roads.
05 3.0i SE in Titanium.
Mods inc - Facelift Xenons, M Sport Wheel & Leather Elec/Heated Seats, 15 & 20mm Spacers & M Tyre Sizes. 3M Carbon Fibre Trim, 4 Spot Clear Rear Lights, Gaptech+, Cruise, MM Tips, ZHP, Stubby.

McDade
Member
Member
Posts: 183
Joined: Tue Mar 29, 2016 4:01 pm
Location: Leeds

Would anyone be interested in having their back box modified?

Post by McDade » Mon Jul 25, 2016 11:53 am

Certainly interested, but need to get my roof motor revived first!

Will contact you once i get that sorted!

Cheers
2014 Vauxhall Insignia 2.0 SRI Techline - The Daily Drive
2003 BMW Z4 3.0i, Black wi/ Red, SMG - The bit on the side

User avatar
Ducklakeview
Lifer
Lifer
Posts: 4749
Joined: Tue Mar 22, 2016 4:08 pm
Location: Merseyside

Would anyone be interested in having their back box modified?

Post by Ducklakeview » Mon Jul 25, 2016 12:27 pm

McDade wrote:Certainly interested, but need to get my roof motor revived first!

Will contact you once i get that sorted!

Cheers
I could do both, and relocate it to the boot!

Mike
Roof motor repairs/relocations and exhaust mods!
I can refurbish your VANOS and restore that mid-range grunt.
Contact me @ zed4mods@gmail.com

Post Reply

Who is online

Users browsing this forum: Bing [Bot], bz4kev, philipw, Usel and 26 guests