milltek diameter

[Shadows Entity]

does the 2.5" refer to outside diameter or inside diameter? trying to figure out if a 2.75" will slide over but don't know if I have to factor in wall thickness? 

[Shadows Entity]

anyone?

[ruffday]

You will find a 2.75 will be way too big to go over a 2.5 without a reducer.

[Shadows Entity]

yea but if its 2.5 inside with 1.5mm wall thickeness then its 2.5" + 3mm

[ruffday]

But you would still need to find another 3-4mm.

[Volvomeg]

What are you trying to do???

[Shadows Entity]

decat 2.75" to 3" cat to 2.5" exhuast

 

or 2.75" to 2.5"cat to 2.5" exhuast

 

essentially I want to be able to remove cat without having to remove the whole downpipe as I've already snapped a stud and rounded a bolt and this will make it easier

 

so 3" downpipe which bolts to a 2.75" pipe which reduces down to 2" but I want to chop it at 2.75" to clamp a cat on or a straight peice so I can interchange easilly

[ruffday]

If you are doing this to swap over at MOT time then it would be so much easier to swap the complete downpipe.

If you are swapping them over on a regular basis then fit new studs and bolts and they should be ok for years.  

[Volvomeg]

I was considering doing this when i decatted mine but ended up buying a sports cat instead,

 

The milltek system is 2.5in and designed to fit there front pipe from memory so if you have a standard cat am guessing your already running some sort of expander pipefrom 2.1/4 to 2.5in,

 

A 2.5in bit of pipe will slot straight into the milltek centre section so if you get abit of pipe made up with a flange on it and similar on front pipe then you can get 2 matching ones on a cat and straight pipe as swop as you like,