HOW-TO: Gut the pre-cats on your B16

LittleRedMachine · 2008-09-18 08:37:31

This is a how-to thread on gutting the pre-cats on the b16. This is an option for those that would like to not run the risk of having them in the stock header.

Honestly, this was a bit of a pain. The final product is cool. Sounds different... especially higher in the powerband.

I would like to thank Yon (Fenderscratch) and Pat (636specman) for being absolutely awesome with this project.

The pictures are coming and will be edited into this first post.

Obviously, the exhaust is going to be a tad hot... so, make sure the car has cooled off.

This is the order we did things in:

before

removing the splash guard to get to the belt tensioner to remove the alternator.

doing something

disconnecting alternator and removing it

the heat shield that we broke every bolt off except two. we also cut it up to fuck because greg didnt want to put it back on.

what it looks like without the shield

bottom bolts for the manifold

what it looks like with no manifold

ugly fucking waste of engineering dollars

this is the ghey noise that we are getting rid of

this is the amount of shit that came out after cleverly utilizing a bunch of random tools to knock the kitties out

greg checking to be sure all the remnants were removed

after we cleaned it up a little to be sure we got all the dust out.

big ass mess in my driveway

done its back on. refuel.

this is all the work greg did all day

this is why i can express my disapproval of the b16.

(pics courtesy of Pat)

Unplug your battery and all of the clips on the o2 sensors.

Remove your front right wheel and the wheel well cover so you can access the pulley.

Remove the alternator. Start removing the bolts on the heat shield. A note about these bolts... they fucking suck. They will break. Don't worry about it... you're not putting it back on anyhow.

After the heat shield is off, you can access the header bolts. Remove those and the bolts that attach the header to the exhaust under the car.

The header should be able to be maneuvered out of the engine bay.

Now the fun part!!!

Remove the rest of the heat shield on the lower part of the header.

We used a combination of things to get the pre-kitties out... Hammer, flat-head screwdriver, wrench, some random piece of metal that Pat found in his garage...

We started with the flat-head. Use it as a chisel. Make sure you knock out EVERY piece of the pre-cat. Remember, you're trying to avoid pieces going into the motor. Get everything out of there. Use a combination of chiseling and hitting the side of the header with the hammer.

We rinsed out the header with water... not a lot. Just enough to make sure no debris remained.

After it thoroughly dried out, we reattached everything. Yours truly managed to not bolt the header to the exhaust originally... It sounded kind of cool (lol) but, make sure everything is tidied back up.

The car is not currently throwing any check engine light.

(more will be added later)

SpecV118 · 2008-09-19 00:50:23

picsssssss now!!!!!!

naturalsk8ter17 · 2008-09-19 01:10:15

my 6 just turned into a 12

Fenderscratch · 2008-09-19 01:13:36

goddamn ricer activities

Stitch · 2008-09-19 07:53:04

What do you feel as response wise, it has to be a tad quicker up top. I'm kind of excited to do this.

LittleRedMachine · 2008-09-19 08:04:36

It did respond a bit quicker. I wasn't really paying attention much since I was half-asleep on the way home lol.

I have some free time today. I'll play with it some more.

saint0421 · 2008-09-19 08:06:20

Have you done anything to possibly prevent any check engine lights? (o2 spacers?)

LittleRedMachine · 2008-09-19 08:07:55

^^ I forgot to mention that!!

No o2 spacers. No check engine light. The three of us were shocked.

donspecv02 · 2008-09-19 08:22:44

LittleRedMachine wrote:
^^ I forgot to mention that!!

No o2 spacers. No check engine light. The three of us were shocked.

It could take some driving for it to come on. Give it a hundred miles or more before you say for sure that it stays off.

LittleRedMachine · 2008-09-19 08:35:48

Very good point. I'm headed to the middle of the state this weekend (200+ mile round trip). I'll be watching it.

red02v · 2008-09-19 08:45:54

Cool!

sporkhey · 2008-09-19 08:51:42

Hey my motor blew at 12K and no check engine light. I dont think we have check engine lights LOL (im sure we do)

R.I.P.92Rolla · 2008-09-19 09:06:57

sweet atleast the kitten is out!

636SpecMan · 2008-09-19 09:07:49

dead kittys are laying all over my driveway. ill leave it there as a warning to all the others.

Djtorello · 2008-09-19 09:16:46

Nice job, I cant wait for the long term results.

tommymel · 2008-09-19 09:28:46

nice job def cant wait to see pics. i doubt the check engine light will come on.

JOHNYSLEEPER · 2008-09-19 09:49:20

pics are good.... but we were also promised videos..

LittleRedMachine · 2008-09-19 11:15:33

Pics might be a little while longer. Pat can't find the cable for the camera. I thought I had one... turns out, I don't.

Working on the videos now. Trying to find the software for it so I can upload it to my computer.

sporkhey · 2008-09-19 11:33:40

***** waiting patiently *****

Stitch · 2008-09-19 12:39:33

Damn saint that girls ass is delicious.

08RedAlert-SpecV · 2008-09-19 15:08:59

Exhaust note change any?

And Stitch...I laughed so hard, Dr. Pepper shot out of my nose after reading that comment!!! The best ever!!-Doug

LittleRedMachine · 2008-09-20 09:20:06

08RedAlert-SpecV wrote:
Exhaust note change any?

And Stitch...I laughed so hard, Dr. Pepper shot out of my nose after reading that comment!!! The best ever!!-Doug

All the noticeable stuff changed higher in the powerband (exhaust note, seems to pull harder).

faqdavid · 2008-09-29 10:42:29

wheres the pics and vid???!!?? ........ plezze

LittleRedMachine · 2008-09-29 10:45:13

Pat has his camera back and he's working on it.

The SES light did come on (finally lol) Thursday. We're going to space the o2 sensors this weekend. I'm going to bring my camera and take pics of removing everything... so, we'll have two sets of it.

faqdavid · 2008-09-29 11:08:41

kool keep on the update

Fenderscratch · 2008-10-15 13:40:56

Why the hell did I video Pat's balls if we can't yet share them with the world?!

Djtorello · 2008-10-17 22:15:54

Any News? Dealership just replaced my Exhaust manifold. I was in for the Master cylinder recall, They finish and test drove the car to make sure everything was ok, came back, showed me it was done, then noticed the exhaust manifold was glowing. I didnt even have to say anything, they took the car back in, and replaced the manifold. I love my dealership, most of the time.

Fenderscratch · 2008-10-19 20:18:16

Greg will gave pics up right after the unicorn comes out of hiding.

636SpecMan · 2008-10-19 22:30:13

pics edited into the first post

Fenderscratch · 2008-10-19 22:35:22

Don't tell me that cat says 'up' from the view from the bottom...

Fenderscratch · 2008-10-19 22:36:48

And apparently, this only took us 7 1/2 hours.

636SpecMan · 2008-10-19 22:40:09

now some notes.

if youre planning on staying stock looking, i wouldnt do this because every bolt broke off in the holes leaving no chance of getting them out with an easy out.

there are 4 oxygen sensors, be sure you unplug all of them. keep looking, they are all there.

to get the honeycomb out we used a wrench, a ratchet, a long extension, some rigid flat metal piece, screwdrivers. use whatever you can find because they all worked for different parts. its a fucking cunt, so just stick with it until its all out.

dont let the belt slip off of the other accessories while you have the alternator removed. its not that hard to get the belt back on but its easier to zip tie it out of the way.

be sure you reconnect all of the connectors...alternator, oxy sensors, battery terminal.

peace punk bitches

LittleRedMachine · 2008-10-20 00:26:42

Pat... has a way with words.

LittleRedMachine · 2008-10-20 19:45:40

Pics edited into the how-to in first post.

naturalsk8ter17 · 2008-10-20 20:25:02

hmm... for me its either do this or a fab a b15 header and down pipe onto my car and get 02 sims put in

LittleRedMachine · 2008-10-20 20:27:50

I did this before that idea came up and before I found a shop to make me the header/exhaust.

This works for people that want to eliminate the fear of the dreaded pre-kitty failure

naturalsk8ter17 · 2008-10-20 20:42:43

yeah I know what it does and I know you did make this b4 anyone though of the b15/b16 hybrid exhaust thing. I'm a big DIY kinda guy and its nice to see others like me aswell. Its just a dilemna for me because I can chizzle the kittys out for $0 or hotshot header + downpipe installed for 250-300ish =/

LittleRedMachine · 2008-10-20 23:09:20

If you're not going f/i anytime soon, get one made. That way, you're only taking the stock one out once lol.

I'm lazy. Don't mind me.

naturalsk8ter17 · 2008-10-21 00:01:28

I got a shop that wants $650 for a custom header, but they want my car for like month to custom make it. I cant afford to be w/o a car for that long. I'm probly gunna b15/b16 hybrid header that bish, my buddy wants to sell a hotshot header and down pipe for $175. Put that bish on and drive open down pipe to a shop and have em custom weld it to the mid pipe.

636SpecMan · 2008-10-21 16:42:20

next time greg comes over here, i will walk myself through the process again and do a proper howto with and nut sizes

edit, i dont remember there being a procedure in the first post. there is so ill just get nut sizes.

Last edited by 636SpecMan (2008-10-21 16:44:06)

SpecV118 · 2008-10-21 16:43:23

636SpecMan wrote:
next time greg comes over here, i will walk myself through the process again and do a proper howto with and nut sizes as well as the full procedure.

are you sick? pat do a how-to

LittleRedMachine · 2008-10-21 16:44:10

^^ he just did one.

Pat, when we partying... I mean... doing this proper bolt size crap?

marik · 2008-10-21 16:44:55

pat's head is shiny

red02v · 2008-10-21 16:45:56

Nice,
Who's the fucking skinhead?

636SpecMan · 2008-10-21 16:46:23

LittleRedMachine wrote:
^^ he just did one.

Pat, when we partying... I mean... doing this proper bolt size crap?

thursday night?

LittleRedMachine · 2008-10-21 16:47:08

I work till 11 that night. Friday?

SpecV118 · 2008-10-21 16:49:23

wow pats head is shinny.

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HOW-TO: Gut the pre-cats on your B16

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