4 Cats

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Sep 6, 2012 | 03:47 PM

#11

Tim1216

~Chillin on a Dirt Road~

Joined: May 2012

Posts: 597

Likes: 15

From: Pittsburgh, PA

Quote:

Originally Posted by raduque

Tim1216, could you possible post some pics of the pipe that was welded in place of the rear cats? I'd like to get an idea of what it looks like.

Yea sure I will once I'm home

Sep 6, 2012 | 07:10 PM

#12

Tim1216

~Chillin on a Dirt Road~

Joined: May 2012

Posts: 597

Likes: 15

From: Pittsburgh, PA

Here's the pics of the pipe welded in

Sep 6, 2012 | 07:16 PM

#13

jerrybizzle

Jerry

Joined: Oct 2011

Posts: 1,473

Likes: 32

From: meridian, idaho

Quote:

Originally Posted by Tim1216

You can cut the rear cats off and not have a cel or anything and it makes it a lot louder, that's what I did. Or you can cut all 4 off and replace with maggie high flows 94106 or 94136 (have bungs in them for 02 sensor), that's what I got and they're goin on tomorrow

Are the 94136 really only about 80 or less per cat? Thought they were way expensive. I don't have access to shopping websites at work except for summit for some reason.

Sep 6, 2012 | 07:24 PM

#14

Tim1216

~Chillin on a Dirt Road~

Joined: May 2012

Posts: 597

Likes: 15

From: Pittsburgh, PA

Quote:

Originally Posted by jerrybizzle

Are the 94136 really only about 80 or less per cat? Thought they were way expensive. I don't have access to shopping websites at work except for summit for some reason.

Screw summit, amazon my man. Ordered mine for $55 shipped

Sep 6, 2012 | 08:47 PM

#15

jerrybizzle

Jerry

Joined: Oct 2011

Posts: 1,473

Likes: 32

From: meridian, idaho

Nice. I was going to check there, but no access at work. If I get bored that isn't a bad price.

Jan 15, 2013 | 02:44 PM

#16

powerstroke11

Senior Member

Joined: Jan 2012

Posts: 149

Likes: 2

From: Iowa

is that an O2 sensor in the last picture? i thought the back 2 didnt have them?

Jan 15, 2013 | 04:27 PM

#17

jetchaser

Senior Member

Joined: Feb 2012

Posts: 625

Likes: 32

From: St. Louis area

Quote:

Originally Posted by TxCustoms89

If im correct this truck (05) has 4 cats and if i were to gut 2 of them i wouldnt be losing backpressure and hurting performance would i? Just wondering i still have stock muffler with cutout but if i open cutout would like it to be bit louder but dont care for putting a exhaust to be loud all the time....

I curious about the original question. If he gutted the back 2 cats---What would that do to performance and the truck? Help or hurt?

Jan 15, 2013 | 04:38 PM

#18

otto457

Senior Member

Joined: Apr 2009

Posts: 3,683

Likes: 171

Quote:

Originally Posted by jetchaser

I curious about the original question. If he gutted the back 2 cats---What would that do to performance and the truck? Help or hurt?

As answered already, read the link. Gutting kills velocity, also anytime you change the flow past the front O2's, you risk changing the a/f readings. Cats are not a large restriction in the system so there's no performance benefit to really any cat modification unless you're well beyond stock. People create a larger restriction with baffled mufflers than the cats make.

https://www.f150forum.com/f11/exhaus...re-myth-78102/

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