Inlet manifold

Ä‘uro · February 05, 2009, 08:51:28 AM

Can somebody tell me what is the difference btw. inlet manifold fm G40 nd GT ? which one is better for tuning ?

hayesey · February 05, 2009, 10:20:10 AM

the GT one has larger bores in the runners so is better for tuning.

Ä‘uro · February 06, 2009, 10:40:22 AM

but GT manifold can be fitted on PY head ? nd how many mm is wider than g40 manifold?

hayesey · February 06, 2009, 11:01:54 AM

yes it fits right on, loads of people (myself included) use them on their g40s.

From the outside it looks the same, it's just the bores that are bigger. I have no idea how many mm bigger they are. But they make a good difference at the higher end of RPM.

Alexiskayak_7 · February 06, 2009, 11:35:14 AM

Does a chip needed to match the extra air?
What about fuel consuption? Do you have more?

hayesey · February 06, 2009, 01:00:35 PM

you don't HAVE to have a new chip, the existing one will compensate for any extra air flow but as with anything you'll get more benefit (i.e. power) if you get a custom remap done.

It's not going to noticeably effect fuel consumption no.

Ä‘uro · February 06, 2009, 02:00:54 PM

does anybody hs it for sale?

Matty! · July 23, 2013, 12:43:01 PM

Does anybody happen to have the part codes for both inlet manifolds?

As I'd like to check if mine is running one or not.

Also is it JUST the GT or can it be from any Carb'd model?

Matty! · July 24, 2013, 09:00:56 AM

Sorted it:

If the inlet manifold ends in a D it is a G40 manifold and B is a GT one.

Matty! · November 30, 2014, 05:06:08 PM

Im about to embark on fitting a GT inlet to my G40, so whilst they were both off I took some back to back pictures for future reference for users on here.

20141130_164941 by Matty!, on Flickr

LEFT - GT
RIGHT - G40

From the outside the GT inlet tubes look wider and when you look down you can see one is clearly wider inside than the other.