xhaust for 330i

[speeddemon]

Hi guys
As u know i've recently did the decatting and uniQ chip on my 04 330i.
Now i want to do the whole xhaust stainless steel but dont know what size to put on.
Can anyone steer me in the right direction as to what size (mm) will be the best for performance for my car:dunno:
Not much woried about sound just performance if there will be any:mmm:
Thanx

 

[moranor@axis]

i fitted 57mm on my car and i dont really think you can fit bigger without clearance issues... try find someone who can mandrel bend it for you this will improve flow alot over press bent pipes...

 

[speeddemon]

Thanx Moranor:thumb:.. 57mm it is then
were there any noticable difference in performance or is it just all in the mind?

 

[moranor@axis]

well i have a 323i but it has made a difference i noticed i would lose traction easier

do you know what size the outlet of your branches are? if you going press bent you will have to be careful because you might actually flow less than the stock exhaust

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it seems the 330i has duel 50mm outside diameter pipes so the inside should be 47mm i dont think a press bent 57mm will flow better than this because the bends will be too restrictive...

if you cant get a 57mm mandrel bent system i would rather just replace the boxes

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also be carefull some shops dont have a mandrel bender and weld mandrel bends onto strait pipes this does not really flow any better than press bent pipes unless the bends are 90 deg or more

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just look at the difference