I recently got a magnaflow exhaust system on my truck, and a looking at adding headers and possibly cutting off my catalytic converter. I was wondering if anyone when if there was a negative size to this besides enviromental reasons. Also I was told by the guy that did my exhaust my truck would not start without them. Is this true, because I would just think the check engine light would come on?



And I drive an 2004 Ram 1500 3.7 v6.

 

I have dual exhuast with LT headers and no cats and mine starts and drivers fine. I really dislike mechanics and other people who are so close minded.

There is a FAQ on how to trick the PCM when not having cats

How to eliminate CELs when removing CATS...

I stuffed mine with 0000 steel wool though

 

What is the reason for the steel wool???

 

Yeah I figures he was lying since it was techinally illegal but thanks for the input. Any idea on where to get some good quality but cheap headers for my truck?

 

look at summitracing.com and jegs.com

 

He is serious, there are many threads about dealing with the rear O2 sensors when not using cats. I'm getting ready to try it myself as I just put headers on my truck.

Airram.com has some 3.7 shorty headers for $319

 

wow they are liars o i was told that even putting an exhaust system which is perfectly legal and wont hurt anything would RUIN my 5.7L Hemi but i got a second opinon from a better source

 

You could also just keep the cats you know. This isn't 1980 and these aren't your father's cats. When in good condition they are not very restrictive at all. Stock catalytic converters used on these trucks have a better cfm rate than most of the chambered mufflers y'all are installing for better sound.

Some days, I wish I never did that DIY, LOL...

 

Steel wool helps filter and keep the exh gas away from the O2 but lets enough in so it detects a difference between the post cat O2 and pre cat O2.

Guys, although there is a science to exhaust when it comes to flow and velocity and heat (EGT), the over all concept is simple. Get air in through the intake, mix it with fuel, burn it and expel it out through the exhaust pipe. The less restrictions the better but going too big of a pipe looses velocity.

Hammer, if you hadnt, you know I would have......lol