Another Decat Method

After looking into the end of the cats, it looks to me like they have to add to the exhaust system back pressure, so I decided it was time to get rid of them. I'm also running a map meant for an open racing exhaust system, and I'm pretty sure it will work better without the cats.

I tried cutting out the honeycomb with hole saws, and discovered that the material is almost indestructible. Can't cut it with hole saw or drill, and can't break it up in pieces to remove. I finally gave up and just welded in a couple of sections of straight 304 stainless 2" exhaust tube. I'm having some problems with my TIG at the moment, so I had to do the welds with the MIG. The are functional, but not as pretty. Nice looking MIG welds in .049" stainless exhaust tubing appear to be beyond my skill level. I'm hoping they will eventually color with heat to match the rest of the system.

The bike has been down for a bit while I was sorting this out, and I'm now looking forward to putting some more fun miles on it.





Ken

Ken,

Getting rid of the cats is necessary if you intend to increase fueling for power.
Cats can actually overheat with excessively rich exhaust, and crack and partially block the exhaust line.

I see you have the gen2 SBN Dominator silencers.
I have the gen1 units with de-cat SBN headers so my system is straight through as your's is.
The sc 090 map works best for my system, but still has some issues.
The 077 map ran much too lean with this exhaust configuration.

There is a forum member - BPHORSEGUY who was able to breakout the cats from his headers.
If I recall I think he used some type of impact tool to crack the cat into pieces, and then removed it piece by piece.
Maybe Bob will chime in and describe exactly how he did it.