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mustangendsley 05-20-2012 07:52 AM

CNT DP mating up with SPT CBE
I have the CNT DP and SPT CBE with a grimspeed gasket and still have a leak. It is tight together. What do i need to do or try?

mwm5094 05-20-2012 09:48 AM


mustangendsley 05-20-2012 09:58 AM

It is leaking out from the top pretty good. If i pull down on the two (dp and CBE) at the joint it goes away a little, but not much.

MatsuDano 05-20-2012 11:34 AM

Stupid question, but did you replace the donut gasket?

No DRFT 05-20-2012 12:21 PM

Now did you use an adapter? That goes from DP 3" to CB 2.5"? Gasket on DP side and donut on CB aide?

mustangendsley 05-20-2012 09:18 PM

No I just used a greemspeed flat gasket. I thought the SPT cbe is 3". I did not use a donut gasket

MatsuDano 05-21-2012 05:04 AM

Well, that's your problem.

The SPT is 2.5" at the flange which mates to the DP. You need to get the 2.5" to 3" adapter, and get a new donut gasket as well.

For future reference, the SPT is 2.5" at that point, but buffs out to 3" just a few inches further down. Then it shrinks down again at the Y.

bmx045 05-21-2012 06:59 AM

had the same problem. you'll need the adapter. i tried doubling up the flat gaskets, rtv, etc, kept leaking from the top. got the grimmspeed adapter with new donut gasket and flat gasket and all is well. there's an angle conflict between the two pipes so the donut is pretty much required.

mustangendsley 05-21-2012 12:14 PM

Thanks to everyone. I order everything.

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