Omega Owners Forum - Decatting and removing the middlebox on an MV6?

Justanother Dave Newbie Offline Posts: 17 Drives: Omega MV6	Decatting and removing the middlebox on an MV6? 12. Jan 2011 at 19:05 Hi Guys, I bought a V6 because I like the sound. I'm not a boy racer or a chav etc, and was wondering if freeing up some of the delicious V6 sound by decatting and removing the middlebox has any consequences I should be aware of? Any other suggestions also welcome.
Back to top	Previous Cars - 2005 Skoda Fabia vRS (251 Bhp/400lbs ft) 2006 Skoda Octavia II vRS (270 Bhp/320lbs ft) 2000 Omega 2.5 V6 Auto 2009 GT Avalanche 3 Mountain Bike (Powered by an idiot and 2 feet) IP Logged

Bent valve Intermediate Member Offline Posts: 386 Drives: Omega 3Litre elite estate, Merc 190E	Re: Decatting and removing the middlebox on an MV6? Reply #1 - 12. Jan 2011 at 19:19 You will have to be very friendly with your mot tester, but apart from that I cant see any problems
Back to top	IP Logged

lee4206 Senior Member Offline Mot Tester Posts: 665 southampton Gender: Drives: Manual facelift 3.0mv6	Re: Decatting and removing the middlebox on an MV6? Reply #2 - 12. Jan 2011 at 20:23 Just a warning if you remove the centre boxes you may find the noise level unbearable. I went through the agro of cutting mine out and welding in new pipes only to go around the block come back and remove the pipes to re-weld the boxes back in. Lee
Back to top	VAUXHALL TRADE CLUB AND HALFORDS TRADE CARD AND V6 LOCKING KIT HOLDER always happy to help if poss IP Logged

cem Omega King Offline Posts: 13920 Ankara/Turkey Gender: Drives: 97 2.5 V6 Manual CD- Clio Sport	Re: Decatting and removing the middlebox on an MV6? Reply #3 - 12. Jan 2011 at 21:06 you will loose low rpm torque which is more useful in urban driving.. resulting with increased consumption..
Back to top	IP Logged

Welung666 Omega Lord Offline Posts: 9768 West Midlands Gender: Drives: 99 2.5 saloon Tractor	Re: Decatting and removing the middlebox on an MV6? Reply #4 - 12. Jan 2011 at 21:33 If you want a bit more noise but not too loud leave the centre boxes alone and replace the back box with a straight through. It impacts the consumption much less and gives a lovely growl
Back to top	Vehicle Movements, MOT's, tints and Repairs - PM for details. CLICK HERE for instructions - how to Paperclip/Pedal test your car IP Logged

GooseMan

Omega Knight

Offline

Posts: 1351
Shropshire
Gender: male

Drives: 3.2 saloon special

Re: Decatting and removing the middlebox on an MV6?
Reply #5 - 12. Jan 2011 at 21:38

Welung666 wrote on 12. Jan 2011 at 21:33:

If you want a bit more noise but not too loud leave the centre boxes alone and replace the back box with a straight through. It impacts the consumption much less and gives a lovely growl Thumbs Up!

Lee,
Do you think it would be around 10% down in MPG across the range (urban or combined) from the standard set up if you go this route?.

Back to top

« Last Edit: 12. Jan 2011 at 21:40 by GooseMan »

IP Logged

Welung666

Omega Lord

Offline

Posts: 9768
West Midlands
Gender: male

Drives: 99 2.5 saloon Tractor

Re: Decatting and removing the middlebox on an MV6?
Reply #6 - 12. Jan 2011 at 21:41

GooseMan wrote on 12. Jan 2011 at 21:38:

Welung666 wrote on 12. Jan 2011 at 21:33:

If you want a bit more noise but not too loud leave the centre boxes alone and replace the back box with a straight through. It impacts the consumption much less and gives a lovely growl Thumbs Up!

Lee,
Do you think it would be around 10% down in MPG across the range (urban or combined) from the standard set up if you go this route?.

Full decat and straight through or just the backbox off?

Back to top

Vehicle Movements, MOT's, tints and Repairs - PM for details.

CLICK HERE for instructions - how to Paperclip/Pedal test your car

IP Logged

GooseMan

Omega Knight

Offline

Posts: 1351
Shropshire
Gender: male

Drives: 3.2 saloon special

Re: Decatting and removing the middlebox on an MV6?
Reply #7 - 12. Jan 2011 at 21:47

Welung666 wrote on 12. Jan 2011 at 21:41:

GooseMan wrote on 12. Jan 2011 at 21:38:

Welung666 wrote on 12. Jan 2011 at 21:33:

If you want a bit more noise but not too loud leave the centre boxes alone and replace the back box with a straight through. It impacts the consumption much less and gives a lovely growl Thumbs Up!

Lee,
Do you think it would be around 10% down in MPG across the range (urban or combined) from the standard set up if you go this route?.

Full decat and straight through or just the backbox off?

Can't afford the full decat & straight through, too expensive.
Was bored this weekend, so thought I'd go to my local Powerflow agent, and being nosy I asked how much for just a back box conversion, they wanted £250 Shocked

(editted...Swaring takes place here kids) how much Cheesy

.
So thinking of going old school route with couple of cherry bomb silencers tacked together

Back to top

« Last Edit: 12. Jan 2011 at 21:48 by GooseMan »

IP Logged

Welung666 Omega Lord Offline Posts: 9768 West Midlands Gender: Drives: 99 2.5 saloon Tractor	Re: Decatting and removing the middlebox on an MV6? Reply #8 - 12. Jan 2011 at 21:57 Just dump the back box, I can get various bends and straights and I'll make you a twin exit boxless for the rear end. A consumption change of around 3% and a massive sound improvement
Back to top	Vehicle Movements, MOT's, tints and Repairs - PM for details. CLICK HERE for instructions - how to Paperclip/Pedal test your car IP Logged

GooseMan

Omega Knight

Offline

Posts: 1351
Shropshire
Gender: male

Drives: 3.2 saloon special

Re: Decatting and removing the middlebox on an MV6?
Reply #9 - 12. Jan 2011 at 22:05

Welung666 wrote on 12. Jan 2011 at 21:57:

Just dump the back box, I can get various bends and straights and I'll make you a twin exit boxless for the rear end. A consumption change of around 3% and a massive sound improvement Thumbs Up!

Ooo... get to tinker with me mega mig finally (while I can). Okay sounds good to me (pun not intended). I'll get a couple of silencers for the tweak. What am I aiming for, short fat or long thin silencers to get the deep growl sound... Cheesy

P.S. can you pm me precat conversion link you sent me for the adaptors, as I've rather embarrassingly gone and deleted your pm in a spring clean Embarrassed

Cheers

Back to top

IP Logged

Welung666 Omega Lord Offline Posts: 9768 West Midlands Gender: Drives: 99 2.5 saloon Tractor	Re: Decatting and removing the middlebox on an MV6? Reply #10 - 12. Jan 2011 at 22:20 Yes I'll send it to you again. No need for silencers, the rear end will just be pipes and I can get those
Back to top	Vehicle Movements, MOT's, tints and Repairs - PM for details. CLICK HERE for instructions - how to Paperclip/Pedal test your car IP Logged

Sixstring Omega Baron Offline Its just GOTTA be a big V6. Mmm....NOS........ Posts: 2203 Lydney, Gloucestershire Gender: Drives: '99 Omega 3.0 Elite Estate with pikey hook, and Suzuki RF900 Motorcycle. Oh, and a MGZS180 and Renault Grande Espace 2.2DT (for work)	Re: Decatting and removing the middlebox on an MV6? Reply #11 - 13. Jan 2011 at 10:45 LEE.... Please forgive my butting in, but on an estate V6 where you have two pipes into the rear backbox, is it relatively easy to just have twin tailpipes with no rear back box, and does it impact on mpg too? Many thanks and apologies for hijack! Mike
Back to top	Self confessed Electro-Mechanical nut, Guitarist/Singer and Motorcyclist. Drives an estate due to all the equipment he has to carry,Electrickery fiddler who loves Automatics and BIG Vee engines. IP Logged

Welung666 Omega Lord Offline Posts: 9768 West Midlands Gender: Drives: 99 2.5 saloon Tractor	Re: Decatting and removing the middlebox on an MV6? Reply #12 - 13. Jan 2011 at 13:24 The difference on the MPG is negligable, 2 or 3% tops. Louder though by a fair way. If you've ever run your V6 without a back box you'll know the growl I mean. Easy enough to do too
Back to top	Vehicle Movements, MOT's, tints and Repairs - PM for details. CLICK HERE for instructions - how to Paperclip/Pedal test your car IP Logged

GooseMan

Omega Knight

Offline

Posts: 1351
Shropshire
Gender: male

Drives: 3.2 saloon special

Re: Decatting and removing the middlebox on an MV6?
Reply #13 - 13. Jan 2011 at 16:33

Welung666 wrote on 13. Jan 2011 at 13:24:

The difference on the MPG is negligable, 2 or 3% tops. Louder though by a fair way. If you've ever run your V6 without a back box you'll know the growl I mean. Easy enough to do too Thumbs Up!

What, loud enough to get a tug perhaps? Roll Eyes

.

Thanks for sending the link again, take a look this time before another clean out !. Grin

Back to top

« Last Edit: 13. Jan 2011 at 16:35 by GooseMan »

IP Logged

Justanother Dave Newbie Offline Posts: 17 Drives: Omega MV6	Re: Decatting and removing the middlebox on an MV6? Reply #14 - 13. Jan 2011 at 22:51 Thanks for the replies. Taking into account everything that's been said here, I think I'll go ahead and try just removing the backbox and see if that gives a satisfactory result.
Back to top	Previous Cars - 2005 Skoda Fabia vRS (251 Bhp/400lbs ft) 2006 Skoda Octavia II vRS (270 Bhp/320lbs ft) 2000 Omega 2.5 V6 Auto 2009 GT Avalanche 3 Mountain Bike (Powered by an idiot and 2 feet) IP Logged

This is the old site. Please use the new site.

This is the old site. Please use the new site.

www.omegaowners.com/forum/index.php.

This is the old site. Please use the new site.

	Welcome, Guest. Please Login