200,000 miles on stock cat, should i replace? other qustions w\in
#1
Supreme Member
Thread Starter
200,000 miles on stock cat, should i replace? other qustions w\in
Everytime i start my car i hear a rattle type sound which i thought was coming
from under the hood, today i finaly decided not to be lazy and check it, well
it sounded like it wasn't coming from under the hood, and i listen under my car
and i hear this weird sound coming from around my cat, really odd sound, like i
have an exhuast leak, im almost 100% postive that the cat is original, and
everyonce in a while when idleing i can hear a rattling under the passenger
side of the car, should i replace my cat, also wut kind should i get?
------------------
88' GTA 350 MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass
from under the hood, today i finaly decided not to be lazy and check it, well
it sounded like it wasn't coming from under the hood, and i listen under my car
and i hear this weird sound coming from around my cat, really odd sound, like i
have an exhuast leak, im almost 100% postive that the cat is original, and
everyonce in a while when idleing i can hear a rattling under the passenger
side of the car, should i replace my cat, also wut kind should i get?
------------------
88' GTA 350 MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass
#2
Junior Member
Join Date: Aug 2001
Location: wisconsin
Posts: 55
Likes: 0
Received 0 Likes
on
0 Posts
I am having the same problem u are my cat rattles and leaks especially when I first start it. Right now am thinkin about dumpin the cat but that could hurt emissions. (but i might still do it anyway)Another option is to order a high flow cat(I think dynomax makes one) from jegs or summit, that could solve the problem, and give u a little better performance.
------------------
I Love Smokin Tires
(stangs fear me)
------------------
I Love Smokin Tires
(stangs fear me)
#3
Supreme Member
My car rattled when I was stopped in drive. When I put it in neutral the rpms smoothed out and the rattle went away. Turned out that my heat shield on my cat had rusted apart and the top and bottom were rattling against each other.
#4
Junior Member
Join Date: May 2001
Location: Budd Lake, NJ
Posts: 56
Likes: 0
Received 0 Likes
on
0 Posts
Car: 2002 Camaro SS
Engine: LS1
Transmission: 6 speed
Axle/Gears: GM 3.42
a real ghetto way to fix the cat heat shield rattling is to take a few stainless hose clamps, and attach them to each other making one big clamp that is long enough to go around the whole cat. then just tighten it down and voila...heat shield rattles are over.
------------------
=====================
1992 25th Anniversary z28 Convertible
------------------
=====================
1992 25th Anniversary z28 Convertible
#5
hehe mine rattled too but it was "only" 115k miles old...something else was wrong somewhere in my exhaust because the sound coming out of the pipe made some wierd *** noises too...
#6
Supreme Member
You can get a catco cat from summit for $50. Its about 6" shorter than stock, so just buy a piece of pipe the same diameter. My catco cat was 3" ID so the 3" pipe slid right in. We cut the flange off my cat-back and put a 3" ID to 3" ID connector on the two and it worked great.
------------------
Chuck Kulchar
1991 RS
Open Element w/K&N
3.42 - posi - disc
3" cat and Force II cat-back
------------------
Chuck Kulchar
1991 RS
Open Element w/K&N
3.42 - posi - disc
3" cat and Force II cat-back
#7
Supreme Member
Thread Starter
its not the heat shield, its on tight, but do u guys think i should guy my cat? if so wut exactly do i do, just take it off and punch out all the stuff? i have another year before emissions, and i'll either sell the car back to my uncle or replace the cat before i get it tested? is there any disadvantages to gutting a cat?
------------------
88' GTA 350 MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass
------------------
88' GTA 350 MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass
Trending Topics
#8
Senior Member
Join Date: Jul 2001
Location: St.Charles, MO/ Edwardsville, IL
Posts: 602
Likes: 0
Received 0 Likes
on
0 Posts
Car: '03 S-10/ '87 Trans Am
Engine: mild 350
Transmission: TH350
Simply put, yes. To gut a cat all you do is take it off and knock the insides out. Then if you have a carb set the A/F a little richer. I'm getting ready to hollow mine when my flowmaster comes in. The sound is much better (in my opinion) with a hollowed cat, then when it comes emmisions time you can slide a high flow cat on there.
------------------
Matt
1984 Camaro Z28
-'78 350 with Edelbrock 600 Carb, Edelbrock Preformer RPM Air gap intake, ACCEL plugs & wires, 14" Accel filter.
-TH350 with Hurst Pro-matic shifter & B&M Street shift kit.
-Audiobahn single 12" Sub powered by Sony Xplode amp, Farenheit 6x9" & 4x6" speakers, with a Sony Xplode headunit.
- Eagle Alloys 15" Alum. Rims surrounded by P235/60R15 BF Goodrich Radial T/A's
------------------
Matt
1984 Camaro Z28
-'78 350 with Edelbrock 600 Carb, Edelbrock Preformer RPM Air gap intake, ACCEL plugs & wires, 14" Accel filter.
-TH350 with Hurst Pro-matic shifter & B&M Street shift kit.
-Audiobahn single 12" Sub powered by Sony Xplode amp, Farenheit 6x9" & 4x6" speakers, with a Sony Xplode headunit.
- Eagle Alloys 15" Alum. Rims surrounded by P235/60R15 BF Goodrich Radial T/A's
#9
Supreme Member
Join Date: Jul 2001
Location: Pueblo Co
Posts: 3,974
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1989 C4
Engine: L98
Transmission: 700r4
Axle/Gears: 307
Yea especialy with 200k on the cat you should defenetly replace it. The avarage life span is around 60k so you got your moneys worth .
But when you do replace/remove it you will think you got a 454 under the hood because that thing is full of crap and is choking performance.
SSC
But when you do replace/remove it you will think you got a 454 under the hood because that thing is full of crap and is choking performance.
SSC
#10
Supreme Member
Join Date: Jul 2000
Location: Naperville, il usa
Posts: 1,686
Likes: 0
Received 0 Likes
on
0 Posts
where should we order? me too i got a bad cat....
decnet price for what to get..
------------------
91 FireBird 305 V-8
Edelbrock Catback, Fourth Gen Console. i have six cupholders. all for starbucks!
ghetto rigged cold air intake,
GheTTo Riggers INC.
We Make Mcgyver look Like Crap
God Created The Earth, And Then Turned Up The Bass
decnet price for what to get..
------------------
91 FireBird 305 V-8
Edelbrock Catback, Fourth Gen Console. i have six cupholders. all for starbucks!
ghetto rigged cold air intake,
GheTTo Riggers INC.
We Make Mcgyver look Like Crap
God Created The Earth, And Then Turned Up The Bass
#11
Supreme Member
Thread Starter
i just learned that my cat was already gutted, talked to my uncle who owned the car behind me, and he said when he got it, it was already gutted.
------------------
88' GTA 350 MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass
------------------
88' GTA 350 MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass
#12
Supreme Member
Join Date: Jul 2000
Location: Naperville, il usa
Posts: 1,686
Likes: 0
Received 0 Likes
on
0 Posts
stoopid cat,
Mines welded on.. WTF with a U Bolt over it,
Dmnnn. iwth some pipe comming out, any of you got any recommendations...
------------------
91 FireBird 305 V-8
Edelbrock Catback, Fourth Gen Console. i have six cupholders. all for starbucks!
ghetto rigged cold air intake,
GheTTo Riggers INC.
We Make Mcgyver look Like Crap
God Created The Earth, And Then Turned Up The Bass
Mines welded on.. WTF with a U Bolt over it,
Dmnnn. iwth some pipe comming out, any of you got any recommendations...
------------------
91 FireBird 305 V-8
Edelbrock Catback, Fourth Gen Console. i have six cupholders. all for starbucks!
ghetto rigged cold air intake,
GheTTo Riggers INC.
We Make Mcgyver look Like Crap
God Created The Earth, And Then Turned Up The Bass
Thread
Thread Starter
Forum
Replies
Last Post
transaero
Engine/Drivetrain/Suspension Parts for Sale
2
08-31-2015 01:14 AM
NBrehm
Engine/Drivetrain/Suspension Parts for Sale
1
08-25-2015 11:49 PM