the exhaust on my 1242 rattles like there is no tomorrow, now i am told the back box was fitted by the people at powerflow... and apon inspection yesterday there is NO flexi pipe on there at all.... just a single straight piece of pipe running from the cat to the back box!!!

is it likely to be this lack of flexi bit in the exhaust causing it to rattle? as it seems to rattle down the whole length of the exhaust...

In a word.....

YES

The way Powerflow does its replacement/performance exhausts work that way. Eventually it will break.
This is why I use only the likes of Supersprint. They integrate flewi joints that are expensive to make but work out cheaper in the long run.

mine started ratteling on my 1242 so i took it to my mates garage. turns out the centre section had moved slightly causing it to rattle on the anti roll bar. I moved it, no big deal. I have no flexi pipe eithier. do you have a standard manifold on it?

Oldschool said:

The way Powerflow does its replacement/performance exhausts work that way. Eventually it will break.
This is why I use only the likes of Supersprint. They integrate flewi joints that are expensive to make but work out cheaper in the long run.

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i talked to long life who said it MUST heva a flexi pipe or it will eventually fall apart.

prob goin up there next week sometime to c wat they say about it!

no thats not true. you don't NEED a flexi at all. it depends how the exhaust is attached to the manifold. My 4 branch has a joint held in place by 2 springs eliminating the need for a flexi. TBH i would just take it back to powerflow. They are covered by warranty.

SpYkE said:

no thats not true. you don't NEED a flexi at all. it depends how the exhaust is attached to the manifold. My 4 branch has a joint held in place by 2 springs eliminating the need for a flexi. TBH i would just take it back to powerflow. They are covered by warranty.

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well i have only just bought the car from jamie, and he told me powerflow fitted it, but there is nothin to proove it.

to be honest i would rather take it to long life and c wat they say.

mine is a 1242 but is running off a standard manifold, but the CAT doesnt look standard so i dunno wat exactly has been done.... will just c wat these guys say next week

Ah right I see. I took mine to powerflow to have some welding done on the centre section, basically because we bodged it on when we fitted the engine. (we cut the flexi off as it was blowing then bodged a vectra centre section onto the remaing part then to the manifold)

I did mention to him that it used to have a flexi and he said that the spring joints are better anyway.

Where abouts does it rattle from?

it seems to rattle all the way back from behind the cat.... especially when pulling away and changin gear!!!

Hey, my exhaust has started rattling really REALLY noisy. Ive got a Janspeed backbox but the rest is the standard system. Is the rattling from the flexi pipe? I though it might have been the catalytic convertor. Its coming from around that area. If I get the full Janspeed system will it solve the problem and does it replace the cat?

Duncan said:

Hey, my exhaust has started rattling really REALLY noisy. Ive got a Janspeed backbox but the rest is the standard system. Is the rattling from the flexi pipe? I though it might have been the catalytic convertor. Its coming from around that area. If I get the full Janspeed system will it solve the problem and does it replace the cat?

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is it only in the low gears? and when pulling away particularly in second?

u might wanna check your rear engine mount, which is near the cat, they wear out quite often and cause an unholy racket!

either that or it might be the flexi pipe!

and a full system is only from the CAT back... the standard cat will stay in place, unless u buy a separate sports cat or decat pipe!

It was mostly accelarating in lower gears, but now its most off the time, specially when the engines just idling. Its definetly coming from the exhaust. So the Janspeed system scraps the flexi pipe? Hmmmm, its payday today

Duncan said:

It was mostly accelarating in lower gears, but now its most off the time, specially when the engines just idling. Its definetly coming from the exhaust. So the Janspeed system scraps the flexi pipe? Hmmmm, its payday today

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i think it included a flexi pipe.... u dont wanna scrap the flexi pipe unless u have some other way (like spyke) of absorbing the engine movement....

i know long life do a stainless steel flexi pipe for about £85 which has a lifetime garuntee with it!

Hi
I had the same problem,i bought a stainless flexi from mill auto for £20(i`ve got the part number if anyones interested)they didn`t even know it was stainless till it arrived,i then had a complete centre section (no centre box)made and joined to my magnex back box, and fitted by custom chrome for £60
Cheers
Adrian

SpYkE said:

no thats not true. you don't NEED a flexi at all. it depends how the exhaust is attached to the manifold. My 4 branch has a joint held in place by 2 springs eliminating the need for a flexi. TBH i would just take it back to powerflow. They are covered by warranty.

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The two springs are a flexi joint.

Yep, like the old peugeots, flexi is there to allow for the movement of the engien under load and braking.

Group N system for the Cinq has no flexi but rally drivers don't care about rattles.

My own exhaust was chewing through flexi's like no tomorrow and I was sick of replacing the middle section, I did what Adrian did and got a custom flexi made up with pipe slightly larger in diameter to the rest of the system, slide it over the front and middle section, two normal clamps and roberts your aunts husband!

Liam

Hang on! How do Demon Tweeks justify £299 for the s/s Janspeed system?! Is that the price including back box? If its just the from the cat to the back box that seems like alot of money for not alot of pipe?

Duncan said:

Hang on! How do Demon Tweeks justify £299 for the s/s Janspeed system?! Is that the price including back box? If its just the from the cat to the back box that seems like alot of money for not alot of pipe?

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Its £300 of italian research and development youre buying. Janspeed know their stuff...

Oh, and it's stainless steel I think...that is more expensive than mild steel as more / different (and therefore expensive) fab processes are needed to create it.

Have you ever seeen how involved the aking of a proper exhaust is.
Firstly it is not a Powerflow with bends creasing everywhere and then it is assembled properly without doggy crimping.
This sort of money is no money for a quality product. It is very labour intensive. A proper mandrel pipe bender costs from £ 6000 upwards. And this is not a CNC one. And welding and bending is not done by pressing a button.
And as mentioned by Tom there is a lot of research to do.

Having thought about it that doesn't seem like alot. Stupid thing to say in the first place! Sorry.