Sports Cat - Advice
Posted: Mon Nov 13, 2017 8:55 pm
I want to improve the sound from the straight 6 plus improve the mpg.
11 yrs ago I had an rx8 which ate cats for breakfast, after mazda refused to replace the cat for the third time, instead wanting £1500 out of my pocket, I replaced the cat with a Blueflame 200 cell race cat. The sound at lower revs was slightly deeper but when it hit 4.5 to 9.5k it sounded like a v12 on steroids, performance and mpg was also improved, when I had it remapped to oem japanese tune (250bhp) it was putting out a smidge over 260bhp.
So I am thinking a midpipe 200 cell stainless cat with a port for the lambda sensor to prevent a CEL would be the way to go, expecting around 10bhp more and being more free revving? I don't want to knock out the insides of the cat, which would be the easy route, incase it is too loud.
Now for the questions:-
Has anyone done this? If so did you fit two seperate cats or one similar to what is already fitted? I have attached a pic of a jetex performance cat which looks like it will do the job except that there is no lambda port.
Is it really loud or just a bit deeper and burbly?
Did you get a CEL?
If no one has done this, what is the size of the tubing? 2"? 2.25"? 2.5"?
Has anyone just removed the mid cats completely? If so what is that like in terms of sound, mpg and performance.
Any advice/info much appreciated.
11 yrs ago I had an rx8 which ate cats for breakfast, after mazda refused to replace the cat for the third time, instead wanting £1500 out of my pocket, I replaced the cat with a Blueflame 200 cell race cat. The sound at lower revs was slightly deeper but when it hit 4.5 to 9.5k it sounded like a v12 on steroids, performance and mpg was also improved, when I had it remapped to oem japanese tune (250bhp) it was putting out a smidge over 260bhp.
So I am thinking a midpipe 200 cell stainless cat with a port for the lambda sensor to prevent a CEL would be the way to go, expecting around 10bhp more and being more free revving? I don't want to knock out the insides of the cat, which would be the easy route, incase it is too loud.
Now for the questions:-
Has anyone done this? If so did you fit two seperate cats or one similar to what is already fitted? I have attached a pic of a jetex performance cat which looks like it will do the job except that there is no lambda port.
Is it really loud or just a bit deeper and burbly?
Did you get a CEL?
If no one has done this, what is the size of the tubing? 2"? 2.25"? 2.5"?
Has anyone just removed the mid cats completely? If so what is that like in terms of sound, mpg and performance.
Any advice/info much appreciated.