Exhaust Diameters!


Barryl85

Barry L 85
Joined
Jan 16, 2007
Messages
1,565
I am currently using a buddyclub cat back system with 2.25" diameter and 2.25" diameter decat - i am upgrading to a B18C engine and would like to use a 2.5" header/manifold - is this possible and how would fitment be?

I will eventually get a 2.5" system but at the moment i dont want to buy a new header just for the b18 at 2.25" and then have to buy another when i want to upgrade to 2.5"
 
It will fit just fine, I have a 3" and no problems here. Most of the Japanese exhausts are actually 2.37" with the USDM companies making them at 2.25". You may have to have one custom made, make sure its mandrel bent, it should fit fine, if you plan on building it past 200whp i suggest a 2.75".
 
Thanks blinx!!

Well i seen the d-c sports 2.5" header which i was considering!

And well im hoping it will match up with my 2.25" system!
 
no it will not mate. i had exact same problem.

I put a b18c into my jordan but didnt have enough money for a whole new exhaust system, so i bought just the mani and it would not fit onto the 2.25" decat,

you could drill new holes in the manifold flange to line up with the decat?
 
Better to drill holes in the decat to fit the mani ;) since the decat is cheaper...
 
Does the donut gasket fit inside the decat pipe tho?

how did you eventually manage to get it to fit then dave?
 
you should try a flex pipe rather than a donut for that complex system.
 
Does the donut gasket fit inside the decat pipe tho?

how did you eventually manage to get it to fit then dave?

i didnt fit it mate, i used OEM b16 on my b18c until i sorted it

iirc the donut gasket just fitted in but the bolt holes were miles off
 
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