De-cat standard fireblade rr4

Hope you all have had a good Christmas, I am thinking of doing a De-cat on my rr4 and was just wondering if anyone had done this yet and what was the outcome they had for doing it.

 

Just done this to my RR7, as for the outcome...don't really know yet as it's not really the weather, though when I was blipping the throttle afterwards I got a nice blue flame out of the exhaust

I just smashed the contents out using a hammer and long sharp screwdriver took a good belting to get the first hole through the honeycomb but once that was achieved it went fairly easy.
I took the headers off and put them on soft ground so the the pipes didn't suffer too much whilst I did the deed

 

i did on my 04 with other few mods , def worth it

 

I was thinking of cutting it out and welding a new pipe in

 

buy us version header .....
2005 Honda CBR1000RR Stock Header Pipes Exhaust Headers CBR 1000 RR 2004 2005 | eBay

p.s. there is not bung for lambda , easy use us ecu or o2 sensor eliminator (from dynojet)

 

Good find dechef didn't know us models were without cat... Cut mine clean off anyway

 

Didn't realise they even had one? My 05 doesn't seem to have one anyway, well I can't see one and there are no sensors or wires coming off the exhaust and no place to put one either?

 

its located where it sweeps up about 6 inchs up. Little box section thing, no wires or anything coming off it.

 

I don't have a little box section thing, pipe is same diameter?

 

europe


u.s.a.



can you see where the "heater" sit ?

 

does removing the cat make much difference then? I don't remember the last MOT guy checking the emissions? so seems stupid having one?
will check mine again then, as going to give it a 16k service in the new year

 

probably marginal Simon but hey every little helps as they say

 

must be a complete work

 

Power wise I don't think it'll be much, but I'd think there will be a little better bark in the note under acceleration, and a much better crackle on the over run

 

Should give better throttle response and a bit more top end once custom mapped. I have a set of RR4 headers, with cat internals removed, for sale?

 

i can say , mine , after dyno
no cat , us ecu reflashed , modded oem can
+4.3 hp

 

Removed the Cat many moons back and instantly noticed the exhaust note had changed (deeper) gases had speeded up. On the standard headers each pipe has a further restrictor welded just before the collector box pretty sure with that removed better performance can be obtained. Honda use a heavy gauge for their pipes on the 04-07 aftermarket systems use a lighter gauge which helps the exhaust pulses thus enhancing better engine performance.