OEM Exhaust Measurements Inlet/Outlet

[Chedman13]

As there are many posts guessing what the measurements are, I went ahead and took out my OEM exhaust and measured the inlet/outlet. I have all the measurements except the y-pipe. I just used a ruler so no real accurate measurements, but enough to give you an idea. Hope this helps someone:

2003 Infiniti FX45 AWD

Y pipe (these are guesses from other posts):
Dual inlet=2.25 inches (please confirm)
Single outlet = 65 mm (please confirm)

Mid pipe:
Single inlet inner diameter = about 65 mm
Single outlet inner diameter = about 63 mm
other random measurements I took:
Distance from inlet flange inner bolt holes = 93 mm
Distance from inlet flange outer bolt holes = 117 mm
Distance from inlet flange side to side = 130 mm
Distance from inlet flange top to bottom = 95 mm
Distance from outer flange inner bolt holes = 86 mm
Distance from outer flange outer bolt holes = 111 mm
Distance from outer flange side to side = 135 mm
Distance from outer flange top to bottom = 95 mm

Rear section:
Single inlet inner diameter = about 65 mm
Dual tips outlet inner diameter = between 90 mm to 100 mm

 

[Chedman13]

For HKS mid-pipe and rear section, the piping is a simple 65 mm throughout. Tips are 115 mm thought which are larger than OEM tips. I hear HKS Japan has a y pipe but have not been able to locate one in the US or someone who can obtain one. If I do locate one, I'm wondering how expensive it will be as HKS rear section and mid pipe had a hefty premium.

UTR sold two y pipes, dual 2.25" inlet, 2.5" outlet and dual 2.25" inlet, 3.0" outlet. Both UTR y pipes fit OEM mid pipe (and therefore HKS mid pipe). Pierce fit the 3.0" outlet to his Nismo as well, not sure if the 2.5" will fit the Nismo but it should. OEM confirmed by Bigbody who used a 3.0" outlet UTR y pipe and OEM mid pipe and HKS rear section, all bolted up together perfectly.

 

[Dr.2K]

I see you have been doing to research there Ed!

 

[Chedman13]

I see you have been doing to research there Ed!

Yeah, by reading posts I couldn't for the life of me figure out what was true. Trusty ruler helped out=) Just seeing whether my next mod is the intake or y pipe. I did find some Apexi intakes made for the old Q45 that seems to have a 90mm diameter.... we'll see. The M45 has an Injen intake that looks to have the same MAF sensor, I could be wrong. Conrad seems to not like Injen intake due to loss of torque though.

 

[HumbertoCALI]

..... The M45 has an Injen intake that looks to have the same MAF sensor, I could be wrong. Conrad seems to not like Injen intake due to loss of torque though.

Hmm? Can you look into this a bit further and share with us what you find out?

Curiously Intrested in this...
Thanks

 

[Chedman13]

Hmm? Can you look into this a bit further and share with us what you find out?

Curiously Intrested in this...
Thanks

The M45 looks to have the same MAF sensor connectors to the tubes. Injen and Weapon R cover the FX45's differences (circle and rectangle). Now to hacking up a tube that already is very expensive is not realistic. Since it looks like weapon r has all the capabilities of creating an intake for us, let's just hope someone volunteers (hint hint humberto) to go get measurements at Weapon R. They make cold air boxes, ram air kits you name it.

Here is where I got the ideas from, see pictures below. Also the Q45, I found some MAF sensor's that were 90mm. They made an Apexi adapter and cone filter to bolt on, but I can't find where I can buy one to test out.


Here this might help:
(from LMS Power)


Injen M45 intake (ebay pictures):


Weapon R Intake (ebay pictures):

 

[HumbertoCALI]

Give me a couple of days and I will look into it....

 

[Chedman13]

Give me a couple of days and I will look into it....

Sweeet! If it isn't too much trouble, ask about intake MAF holes for us old FXers (pre new rectangle MAF holes).

I did a custom intake with them a while back, they were really nice and responsive. Hope it's the same.