downpipe ???

[linford-quattro]

hi all abit of a repost to get more response. ive had the dpf gutted and mapped for a while now all fine and happy. im going to be having a custom stage 2 and got told i need to do all the exhaust which is no problem. However my question is... is there any difference or atleast noticeable difference in a gutted dpf than a striaght downpipe???? no comments on mot please as ive a friend for that. striaght downpipe against the current gutted dpf any difference or just leave it as it is and do the rest of the system. cheers

 

[LEE69]

far better flowing with no box, that bottom pipe out of the box is restrictive

 

[phil miller]

i cant see a normal pipe would flow any better tbh, yes the shape of the DPF box might not be ideal but cant see it holding you back

 

[LEE69]

i cant see a normal pipe would flow any better tbh, yes the shape of the DPF box might not be ideal but cant see it holding you back

Both were tried on a fb site, a difference was seen

 

[phil miller]

Both were tried on a fb site, a difference was seen

thats worth knowing, that said i didnt give a thought to the DPF outlet pipe angle

 

[linford-quattro]

far better flowing with no box, that bottom pipe out of the box is restrictive

So you reckon its really worth doing then

 

[nluk100]

I can't see it making any significant difference, maybe a few hp and torques but keeping the gutted dpf will make mot time a lot easier and you will be legal.

 

[linford-quattro]

Anyone any more thoughts

 

[linford-quattro]

 

[LEE69]

So you reckon its really worth doing then

From what i read yeah, depends what mot tester you got.

 

[linford-quattro]

From what i read yeah, depends what mot tester you got.

yeah mot isnt a problem. Dont suppose youve a link or anything, ive searched high and low but cant find anything.

 

[LEE69]

No sorry, just recall people saying about it

 

[Macke]

I\d stay with the gutted dpf
I have 3inch straight pipe with "freeflow" box from darkside develoment and i have also deleted my back box and its sound like this:
http://www.audi-sport.net/xf/threads/rattling-sound-after-dpf-delete.263049/

Not pretty!

 

[linford-quattro]

You'll get that sound from removing youre back box its nothing rattling lol. And changing my gutted dpf to a custom downpipe wouldn't alter sound its performance (atleast thats what im trying to find out) the rest of the system will be custom built with a backbox made to keep it quiet as thats how I told him I want it

 

[Macke]

I know but it sounds like rattling It was just a heads up. Im no expert but i dont think theres much to gain with a custom downpipe.
Are you going for a bigger turbo?

 

[linford-quattro]

I know but it sounds like rattling It was just a heads up. Im no expert but i dont think theres much to gain with a custom downpipe.
Are you going for a bigger turbo?

Nope keeping the 170 turbo. Although you may be right in saying the new downpipe wont see much... i think as one of the lads above said about the dpf outlet pipe is restricted, think hes onto a winner as when i remember seeing the dpf off to be gutted it does have quite a bend to it which can only hinder flow