De cat Y

[jojackson4]

Picked a spare Y of the bay and planing on full decat read a post about some cone or in fill in the bust bin left

I can not find anything on the search can any one put some light on it

Thanks Peter

[mach2]

From my limited knowledge a "non reversal cone" is inserted into the dustbin to provide a smooth transition of the exhaust gases from a larger bore to a smaller one. It effectively acts like a funnel.
The top of the y piece is cut open, the cat removed and the cone inserted and welded into place before the top is re-welded.
In principle it is similar to the ACT or Clive F y piece but, retains the original dustbin appearance.

[jojackson4]

That's it

Top man

[StarmistBlue400]

From what I have read it could sound terrible. I changed mine for a Clive F Y piece a coupe of months ago and it really is a work of art and a lot smaller and lighter. I think taking the CAT out if the original can make it drone a lot.

[jojackson4]

Yep that's what I have read
That's why I will be doing the mod that you don't see