davep

Member

• Oct 8, 2009

• #1

I have just aquired a set of tubular manifolds for my 1986 3.5 V8 EFI, but the outlet pipes are 2" which is bigger than my existing Y branch.

Does anyone know if the 3.9 Y branch has 2" pipes and if so is there any reason I cant use one (like is it the same shape ). I don't know if the cross member is the same as a 3.9, I heard there are some round section ones.

 

vougese39

Well-Known Member

• Oct 9, 2009

• #2

with the introduction of the cat exhaust the cross member was changed and a larger bore exhuast was fitted to aid gas flow. i would buy a collector kit and modife the system for what you need of buy the cross member to fit them

 

Khryztal

New Member

• Oct 13, 2009

• #3

My pre cat 3.9 has the newer gearbox crossmember fitted. It also has 2 inch pipe work.
Running a crappy double S system with tubular manifolds.

The manifold flanges should be the same as the 3.5 (remove one cast manifold and check though).

You could probably get away with using a pipe converter to get the smaller bore for the 3.5 system (janspeed do them mail order as do most aftermarket places like A1)

 

davep

Member

• Oct 13, 2009

• #4

Thanks Khryztal, my 3.5 Y-piece is rough so I want to buy a replacement, and so I was hoping that if I buy a 3.9 Y-piece it will mate to my tubulars.
I take it your Double S are still using a standard 3.9 Y-piece.

 

Khryztal

New Member

• Oct 13, 2009

• #5

Nope. The double **** I mean S has a single y pipe instead of the 3 piece standard fitment. It is a total pain in the arse, because if the manifolds are incorrectly made (like mine) you have to struggle like bloody hell to get the to fit.

 

P

POAH

New Member

• Oct 14, 2009

• #6

you got a picture of the fannymolds?

 

Khryztal

New Member

• Oct 15, 2009

• #7

Er, nope. But if ya pm me your email i'll take a couple tomorrow. You just want shots of the headers, or the the whole thing? Just let me know

 

P

POAH

New Member

• Oct 16, 2009

• #8

just wondered what they look like and you might be able to work out who made them.