I am gonna weld a cutout into my hi flow cat so when i want to get on it I can, but for daily driving will the high flow cat be too restrictive?

I am runing a 40R kit and etc...

 

I hope not, as I plan to run a high flow cat with my R85 setup, too. I haven't gotten my car back yet to see how it works, though. I would have to think that some cat should flow enough to allow cleaner, quieter motoring without killing the power too badly. I have an N-Tech cat that seemed to flow reasonably well (based on unscientific butt-dyno experiences) when I was running it with the twins before. That is what I am going to try with my new setup. If that is too small, I will try the biggest high flow cat that I can get from Magnaflow or Dynomax or whoever. Or maybe one of those new metal cats that people have been using.

I did see a dyno test in a Mustang magazine where ceramic, metal, and test pipes (in twin 2.5" config for the V8, I think) were compared. The known high-flowing ceramic cats (the ones they chose were known to be good in the Mustang community) and the metal cat were about the same and the test pipe was only a little bit better. I think the difference was something like 10RWHP higher for the test pipe on a 400RWHP car in that case. I don't remember the exact details, but my impression was that you should be able to run a cat without losing a lot of power.

-Max

 

What about just for daily driving, it shouldn't affect the car, by leaning it out burning the plugs... I don't car about anything like performance for daily driving...

 

Get the new metal cats, they do flow better and work better that most ceramic cats. Houston Motorsport Tech. swears by them on their 500+HP Corvettes. Only loosing about 10HP. But then that is 2 cats per engine.

 

I just wanted to know if I can use it for daily driving...

 

It will be too restrictive for daily driving, but fine for the track

 

Thanks for the constructive quote.

I think the dump will do fine for the track