Anyone removed the cat on the 5vzfe and have actual performance improvements?

Some motors love to breath and simply removing the cat (when / where applicable) increases HP to some degree or another - unless very dependent on back pressure. Anyone removed it for the first gen Taco's 5vzfe and have a power increase? I can imagine it's louder and possibly better sounding, which can be confused with an actual increase in power, but anyone maybe even heard of a dyno or VERY obvious performance increase?

I have heavy towing in my future and any affordable power mods are very welcomed. I figure popping in a mid pipe / straight through pipe in the place of the cat should give me a worthwhile increase up top.

Thanks folks!

 

Gotcha. So would it be better to go with a high flow cat? Or is it even worth it?

 

I have removed mine on my 02 DC and gained about .5 mpg. I tow all the time, boats and trailers with no change in power. Its been gone for over 2 years now.

 

I have replaced my down pipe that hold both catalytic converters with a straight pipe, if u are going to do the same u will need to put a chip on your rear o2 sensor. Assuming u dont have smog checks its a great way to improve power and gas mileage. The o2 sensor simulator i used was from Underdog Racing development, also known as an o2 simulator, it tricks your ecu in to thinking the cats are still there and working properly. i kept my stock muffler and not much of a difference in sound but very noticeable when towing my bobcat especially uphill when i really need the extra power ... a good flowing air filter helps when u need that extra power as well. A cheap, easy and reliable way to do that is to get a universal round air filter like the lifetime warranty Spectre airfilter found at checkers. u can break the stock plastic tube off the stock air box and throw away your air box. Take the tube that u broke off and take the air box end and shave the lip off with a bench grinder and fit the after market air filter on. there u go it sounds good too.. (;

the emissions tube going to the air box can be traced and removed as that only puts air from your gas tank in your engine...

Hope those mods helped u out...

 

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