can m20b25 exhaust manifold be flipped ?

[mops 4]

Hello guys.

Just researching turbo project.

Does anybody know whether m20b25 manifold can be flipped around straight up ? or does that require drillng new holes or even fabricationg complete adaptor ?

cheers.

[drifty325i 0]

It can be fliped, but does need a fair bit of work to get right. IMO its not worth it.

just get on custom made or order on online.

[Guest Andrew]

It can be fliped, but does need a fair bit of work to get right. IMO its not worth it.

just get on custom made or order on online.

agreed after looking at the same idea myself.

[mops 4]

would you recommend a to-buy one ?

there are two types of manifolds for m20b25.

single-piece one and dual-piece one. I do know that dual piece ones flipps straight no, no modifications neccesery.

[drifty325i 0]

Or ask Grant

[drifty325i 0]

I would buy one online myself saves the mucking around, and making sure

its for a right hand drive 325i

[325GRANT 0]

yes it can, but it will need a lot of grinding to match port it.

pretty common in the U.S on "cheaper" turbo builds. im guessing your wanting to use it to turbo your car???

i looked at doing it in the begining but by the time you turn you manifold, grind it to fit and make an adaptor doesnt leave much room for a turbo. (and its a lot of stuffing around) ive had quotes to build a turbo manifold from $600.00 to $900, you will be a lot happier if you just pay for one.

would be interested to see how it works out if you do it.

[drifty325i 0]

$600 /$900 Is fairly decent pricing, is that equal length?

[325GRANT 0]

depends who you talk to...

most people start a quote at $100.00 per cylinder and work from there.

if it was me i would print off some photos you like the look of and take them to people see what they think.

[drifty325i 0]

Thats what i was thinkin aswell

[mops 4]

i have a mate who is a master welder, who will weld it up for me for cheap, while i'll have to pay for materials.

but i wouldnt have a clue how to go about designing one...

[Guest Andrew]

i have a mate who is a master welder, who will weld it up for me for cheap, while i'll have to pay for materials.

but i wouldnt have a clue how to go about designing one...

6 -> 1 equal length - there is enough room.

[325GRANT 0]

6 -> 1 equal length - there is enough room.

...

[325GRANT 0]

...2

[325GRANT 0]

not equal ... but nice for top / front mount turbo

[Gus 5]

sexy...but LHD? the RHD ones ive seen (pics of course) seem to mount the turbo either quite far forward, or high

[Surge 1]

I've considered the PPF (pure-pf.com) turbo manifold, but whether it will work with our steering in the way... Hopefully the downpipe only needs to be altered.

There is an adaptor that runs from the stock manifold then back up to a turbo flange, but then you're dealing with a lovely cast iron manifold thats a bit restrictive for a good turbo setup.. Tubular is the way to go in terms of making power - faster spool etc...

[Guest Andrew]

6 -> 1 equal length - there is enough room.

...

just