Dougster

I am considering removing my "cat" at the time I put on my intake...I do have a single exhaust system in larger diameter then stock to a regular single Muffler...

Is the muffler enough to create the right amount of backpressure to insure the 6 ports to open?

Should the air pump be also removed at this time?
Thanks for any imput guys!

1987RX7guy

iTrader: (3)

They will not work if you remove the CAT. Some people get lucky with the stock exhaust to get it to work but that is still few and far apart. I would sugest either a header/pre-silencer or downpipe/pre-silencer option to eliminate the cats. This will keep you sane and stop the ears from bleeding and make the ports work properly.

Santiago

Dougster

Thanks for your imput!
So the presilencer is enought to create the proper amount of backpressure...About the same amount as a regular cat?

wozzoom

Not the same amount of pressure as the cat, but supposedly enough... From my experiance, the ports open to late with a pre-silencer. (around 4500-5000 RPM)

Other options include:
Keeping the air pump and using the ACV waste line pressure.

Keeping the air pump and using an RPM switch to operate the 6-ports.

Dumping the air pump and using an RPM switch with an electric air pump.

Searching for "electric 6-ports" will give you a ton of info on the topic.

Dougster

OK, thanks much, I was wondering about losing the air pump as well?

Therx7ist

get a dual alternator pulley and a block off plate from mazdatrix. remove your ACV and the airpump. The racingbeat presilencer will have the tube to retain the ports original functionality.

Dougster

OK, gotcha...Thanks much guys!