So hopefully this week im going get a mufflerectomy from my local powerflow garage...

1. researching people have paid £80 (or somewhere in that area), is this about right?
   
2. For that what do i get? (pipe from cat to tip or just back box chop)
   
3. Any real cons to this?
   

3. That it potentially loses power

3. That it potentially loses power

can you explain this? (novice in anything like this)

Never noticed any power loss with mine, however major power loss with a mufflerectomy and de-cat!

Will just be a back box length of pipe for £80 with a tip.

Never noticed any power loss with mine, however major power loss with a mufflerectomy and de-cat!

Will just be a back box length of pipe for £80 with a tip.

Just wanting a bit more sound from it, so would you recommend this?

I've recently mufflerectomied my car, I have a piper decat and a straight through now.

Initially I thought it sounded crap and I wasn't overly impressed. But would I put a backbox back in Now?

Hell no! The extra turbo whoosh sounds and the growl it has more than makes up for the transit like idle.

I'd go for it. If you don't it, it's not a costly problem to weld the box back in.

Not sure about power as I am not sensitive enough to feel - 2bhp.

I would ask though, why would backbox removal reduce power? I thought diesels love straight throughs.

My next plan (next week) is to buy the rest of the piper exhaust. Zero box.

Don't know how it would lose power ? But mine sounds lovely, never noticed any power loss either :S small bit of weight saved off that huge ass back box too

Done then, will get it done back box chop =]

Don't know how it would lose power ? But mine sounds lovely, never noticed any power loss either :S small bit of weight saved off that huge ass back box too

To do with a drop/change in pressure I believe

To do with a drop/change in pressure I believe

ahh right, never noticed any change in mine like

No change here either. I'll get mine dynoed again eventually and see how she runs. Where are you based kdog?

Just wanting a bit more sound from it, so would you recommend this?

Yes mate for a bit more noise you can't go wrong

Mufflerectomy

http://i735.photobucket.com/albums/ww359/Dan_Ham/73B6147F-BFE0-4F4B-AF91-DFBF6AE7256A-6214-000005270396B141.mp4

Straight through from the turbo - sounded ****

http://i735.photobucket.com/albums/ww359/Dan_Ham/63F71E27-FF91-48CD-A34D-2A23AB6C66C4-6214-000005266B55D393.mp4

Got a back box in there now

No change here either. I'll get mine dynoed again eventually and see how she runs. Where are you based kdog?

Liking the name may have to change lol. But I'm based mansfield (notts)

Edited 2 June, 201313 yr by Kgod1991

I had mot advisory last year re rusty back box, if its a failure this year, is it fine to just cut it out and add a pipe in its place?

I had mot advisory last year re rusty back box, if its a failure this year, is it fine to just cut it out and add a pipe in its place?

Yes, that's what a mufflerectomy is

I thought it was, just nice to have clarification that its not any more complicated than that.

Any ideas if MOT place OK like in that situation, e.g just lobbing it out? As just wondering if its blowing to get it sorted before hand, i dont think it is but i dont often hang out round the back of the car while its running.

Just had a quote of 320 after emailing them, think am going to pop down and explain what am wanting.

Though can anyone recommend a place near mansfield/Nottinghamshire

Ok well ill just clear up some things people ain't sure about

1. Removal of back box is perfectly legal as and will pass MOT with no problums at all unless poor job has been done and its blowing or leaking.

But removal of CAT could possibly get an MOT failur depending on if mot assor sore it missing or he was a funny bugger. (Yes most people have there cats removed and have no problum which they won't am just saying what the law actually states)

2. Will removing the back box cause power loss?

Well no it won't cause any loss in any power at all plus it could give a possible gain of a max 2 bhp more than Likly it won't give anything but defo will inprove turbo spool up timeing plus there for giving a slightly better throttle response plus it will lose excess waight of your back box so reduction of about I'd say 7kg so that in thery would gain power yes very very small ammount but would give a gain.

3. Someone above said they throught tdis like straight through systems yes and no is the answer o the above a standerd turbo wouldn't like a stright through 3inch system it would be too large but with a bigger turbo it would like it.

4. A turbod car creates its back pressure through the turbo it's self.

5. How it works in basic turms

Your turbo works through exhaust gasses basicly once your car has completed a full turn of the engine it puts some exhaust gasses out ino the exhaust system which start to turn the turbo then the turbo turning makes air go into the intake system the faster and harder the turbo spins the more air goes into the engine so there for more gases can get out to make the turbo spin faster up to a certain point but of corse the faster the gasses can get out of the car in other words down the exhaust system the faster the turbo can spin in therapy so removing any restrictions ie CAT or silencers (back box) the the exhaust gasses can flow out faster helping the turbo to make more pressure which makes more power (THIS IS JUST A VERY BASIC WAY TO DESCRIBE HOW IT WORKS) I hope this helps some people

"2. Will removing the back box cause power loss?

Well no it won't cause any loss in any power at all plus it could give a possible gain of a max 2 bhp more than Likly it won't give anything but defo will inprove turbo spool up timeing plus there for giving a slightly better throttle response plus it will lose excess waight of your back box so reduction of about I'd say 7kg so that in thery would gain power yes very very small ammount but would give a gain."

Apart from the losing some weight bit, you have zero facts to back these statements up.

The truth is none of us on here are true experts. The people who designed the engine could probably give you a very good idea without actually testing it.... but all of us combined have about 10% of their knowledge (if that).

If I had to guess though I would say there is more change of it losing power than gaining.

By the time the exhaust gases reach the backbox I'd be surprised if passing through through a box or straight to atmosphere would make any difference. Positive or negative.

Thanks to all that have replied, im going to get the back box chopped and a straight pipe with a tip put on.

what i can gather from all comments is that either way increase or decrease it will be so small that you wont notice the difference.

dont want this to turn into a debate!

All replies so far much appreciated though

You are the one who lit the fire now stand back and watch it burn

You are the one who lit the fire now stand back and watch it burn

lol if you say so...

FRED44 what u have stated about my comment just shows the lack of knoage u do have I know none of use are experts and we didn't design these engines but I am a fully qualified machanic who specialise in the diesal engine.

Plus things like the exhaust system are put onto cars for reasons like emissions sound and safety that's all so in other words they aren't put ino the design of the engine and there not put in place to give max power

booked in for tomorrow local powerflow garage £90 will get pictures up when done