Manifold

Madhatter81 · Post by **Madhatter81** » Sat Mar 02, 2013 8:58 am

Morning guys!!!
I'm going to have a full custom exhaust put on my lude but I would be grateful If anybody can advise me on the best size pipe to use on the manifold before it gets made

mercutio · Post by **mercutio** » Sat Mar 02, 2013 11:13 am

who is making it?

Madhatter81 · Post by **Madhatter81** » Sat Mar 02, 2013 12:03 pm

Hi it's an engineering company in Leeds I know well
Just need to know what size pipe to buy

Post by **vanzep** » Sat Mar 02, 2013 1:18 pm

you cant go wrong with 2.5" for custom exhaust or 3" if you plan on going turbo

mercutio · Post by **mercutio** » Sat Mar 02, 2013 1:31 pm

depends on what part of the manifold your talking about primaries or secondaries?

Post by **RattyMcClelland** » Sat Mar 02, 2013 5:50 pm

3" offers best hp on na or turbo. 2.5" is a good compromise for torque and hp and noise.

Madhatter81 · Post by **Madhatter81** » Sun Mar 03, 2013 10:49 am

In talking about the primary
I'll measure the exhaust ports and go from there

Post by **vanzep** » Sun Mar 03, 2013 12:13 pm

ive got my hytech replica header here if you want any dimensions from that

mercutio · Post by **mercutio** » Sun Mar 03, 2013 1:10 pm

normally 1.75" or 2" if i remember right matey

bristol_bb4 · Post by **bristol_bb4** » Sun Mar 03, 2013 3:01 pm

fujitsubo specs -

Primary runner inner diameter - 44mm (~1.73") at head flange
Primary to Secondary merge inner diameter - 48mm (~1.89")

Secondary runner inner diameter - 48mm (~1.89")
Secondary to Collector merge inner diameter - 60mm (~2.36")