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+--- Forum: DW10 HDi section (https://www.306oc.co.uk/forum/forumdisplay.php?fid=10)
+--- Thread: HDi debackboxed (/showthread.php?tid=8082)
HDi debackboxed - aaron_one - 18-11-2012
I'm thinking of getting rid of my standard backbox with the downwards tip as it looks crap. I want to swap with something and heard if you just weld a piece of pipe on instead of the backbox it'll give it a performance gain, is this true?
I've heard of the middle box conversion but I'm just looking at all options before I decide really.
Thanks?
RE: HDi debackboxed - JackLewis_Dturbo - 18-11-2012
you get better flow with no backbox for better gains....
IMO dont bother with the middle box conversion unless you dont like a noisy car! lol even so its not that loud...
RE: HDi debackboxed - Oil-burner - 18-11-2012
Either or mate, that's all I did in my dt.
As long as its got at least 1 box your legal!
RE: HDi debackboxed - aaron_one - 18-11-2012
Cheers guys, so as long as I have a middle box I'm still legal even if its decat and debackboxed?
Think ill go for the debackbox I need a bit of noise in my life!
Will the gain be noticeable if I have decat and stage 1 map?
RE: HDi debackboxed - Chris_90 - 18-11-2012
I just emptied my cat out like this with this the noise level defo went up and i could defo notice the turbo spool quicker
![[Image: 306new65.jpg]](http://i552.photobucket.com/albums/jj332/mazda_323f/306new65.jpg)
And de-back boxed like this, I noticed a slight bit of difference when i did this the noise level did go up slightly
![[Image: 306new53.jpg]](http://i552.photobucket.com/albums/jj332/mazda_323f/306new53.jpg)
RE: HDi debackboxed - Poodle - 19-11-2012
As long as you have one box in your system it's legal, the cat isn't currently required for MOT purposes.
You should notice the gains, the turbo will spool a little earlier thanks to the lower restriction from the exhaust and it will be happier to rev.
RE: HDi debackboxed - aaron_one - 19-11-2012
I'm going to get rid of the backbox sometime in the next week or so then! Do you need a backbox to pass an MOT?
RE: HDi debackboxed - Poodle - 19-11-2012
(19-11-2012, 02:22 PM)Poodle Wrote: ...As long as you have one box in your system it's legal...
RE: HDi debackboxed - aaron_one - 19-11-2012
Oh I was thinking legal as in getting pulled over haha I get it now
RE: HDi debackboxed - Poodle - 20-11-2012
Technically it should be the same thing, if we're talking purely about vehicle defects. Although, what gets you pulled is often 90% discretion of the challenging officer as far as i can tell.
