Cats and Mufflers

[Marauder2005]

Well I know there are endless threads on exhaust but did not see one
That clearly answered my question. I planned on just getting a set of
magna-flow 18" and a set of Magna-Flow cats. maybe change to
Un-resonated tips later, but basically that's all I wanted to change. I noticed/
And read we have 4 cats in our cars. Is it even worth changing out only two?
Will it make any difference preformence/sound wise? And another dumb
question for those of you that bought our cats off "Kooks" is it 240.oo for
The pair, or is that 240.oo for each? Thanks for any help; and dealing with
my ignorance
:o
- Mike

[TAF]

It depends on what you want to accomplish...

Performance....Sound....or both.....

Changing out CATs would need to be replacing all 4 factory CATs for 2 high-flow...anything else would be fruitless.

Mufflers alone will change the sound AND give you some performance (especially switching out the OEM mufflers with the straight-thru Magnaflows). Tips from Megs that are "non-baffled" will make a sound difference, as well...but you'll find no performance difference by just doing those (the exhaust is cooled enough by the time it gets through the mufflers that unless you have Legal Knevil...there is no real need to upgrade the tailpipes for performance reasons.

I did a couple members this week with my new custom, stainless-steel, 2 1/2" X-pipe going to the 18" SS Magnaflows and they feel and will show improvements (we left the factory CATs on both cars)....

I hope this helps answer some of your questions.

[gonzo50]

I did a couple members this week with my new custom, stainless-steel, 2 1/2" X-pipe going to the 18" SS Magnaflows and they feel and will show improvements (we left the factory CATs on both cars)....
Are your new custom X-pipe and Magnaflows for sale to the members here yet ? If it's a direct bolt on, a do it yourself job, then I'm interested. :coolman:

[MarauderMark]

Expect cabin drone once they start to wear in especially on the highway..

[ckadiddle]

Our cars come from the factory with four catalytic converters? What's up with that?

[TAF]

If it's a direct bolt on, a do it yourself job, then I'm interested.No, it would not be a "do it yourself job", Carlos.... 'cause we weld the mufflers/tailpipes and we extend the tips out from under the rear bumper...

But, I'm not far away from you my friend..and you know I'll hook you up.....

[GA-Marauder]

I did a couple members this week with my new custom, stainless-steel, 2 1/2" X-pipe going to the 18" SS Magnaflows and they feel and will show improvements (we left the factory CATs on both cars)....

I hope this helps answer some of your questions.[/QUOTE]

I'm one of the members, and the work was great. Todd's shop uses mandrell (sp?) bending on the ss for flawless and even diameter tubes. I did leave the factory cats on, the downside being that from the manifolds back through the cats you still have 2" pipes (Todd, correct me if I'm wrong here). I definitely notice increased low rpm push as a result of the mod. I would still like a little more noise, though, and am probably going to go with the delete Megs tips. (Todd look for a pm). The overall result I'm going to have dyno'd for objective results, but overall I am very pleased with the mods.:D

[MarauderMark]

No, it would not be a "do it yourself job", Carlos.... 'cause we weld the mufflers/tailpipes and we extend the tips out from under the rear bumper...:up:

But, I'm not far away from you my friend..and you know I'll hook you up.:2thumbs:....


Now this is someone i would goto first , heh i'm sold!!

[Warpath]

Our cars come from the factory with four catalytic converters? What's up with that?

I believe the first set of cats is for when the engine is still cold. These cats warm up quicker since they are so close to the exhaust ports. The cats need to be warm to work well. The second set of cats is for when the engine is at normal temp. It must be that the cats can get too hot to be effective. So, the second set is placed further away where they remain cooler at normal temp. At least that is how I understand things.

[Marauder2005]

Well I know there are endless threads on exhaust but did not see one
That clearly answered my question. I planned on just getting a set of
magna-flow 18" and a set of Magna-Flow cats. maybe change to
Un-resonated tips later, but basically that's all I wanted to change. I noticed/
And read we have 4 cats in our cars. Is it even worth changing out only two?
Will it make any difference preformence/sound wise? And another dumb
question for those of you that bought our cats off "Kooks" is it 240.oo for
The pair, or is that 240.oo for each? Thanks for any help; and dealing with
my ignorance
:o
- Mike
Thanks for the in-put guys----

[hitchhiker]

I think a drive to the ATL area is on order.

Nice to have an exhaust expert here!

:D

[Mattsmerc]

I know this is a repeated question some where in these forums. What is the outcome of no cats? Say you take the cat and hollow it out? More flow = more power? :confused: Reply if you like or show me the thread to go to.

[MENINBLK]

I know this is a repeated question some where in these forums. What is the outcome of no cats? Say you take the cat and hollow it out? More flow = more power? :confused: Reply if you like or show me the thread to go to.

No CAT = CHECK ENGINE LIGHT...

[torinodan]

Rear CAT only= no check engine light. Anything done to the front CAT (removed or gutted) would give a light.
No CAT = CHECK ENGINE LIGHT...

[DEFYANT]

Rear CAT only= no check engine light. Anything done to the front CAT (removed or gutted) would give a light.
Proper computer programing = no check engine light :D

[torinodan]

I have nothing to say about computer programing because thats another rant!! I'm just an email away and waiting. and waiting. and waiting. and waiting.:help:
Proper computer programing = no check engine light :D

[GA-Marauder]

Proper computer programing = no check engine light :D
True? If so, I would consider continuing the 2.5 " forward to the manifold, eliminating the cats entirely. Any opinions?:dunno: Tree-huggers need not apply.:nono:

[torinodan]

I have a few opinions and it is easy. I know because it's been done. You need to turn off the rear O2's or get some MIL Eliminators (fake O2's) from there you can do whatever you want. http://www.zx2racing.com/articles/mil.htm have fun.
True? If so, I would consider continuing the 2.5 " forward to the manifold, eliminating the cats entirely. Any opinions?:dunno: Tree-huggers need not apply.:nono:

[GA-Marauder]

Thanks! Good reading.

[SergntMac]

If so, I would consider continuing the 2.5 " forward to the manifold, eliminating the cats entirely. Any opinions?:dunno: Tree-huggers need not apply.:nono:IMHO, I don't think it's a good idea to mess around pulling cats. To much of a risk with emmission laws, with little (if any) payoff. High flow cats work well, and you're legal. The 2.5OD" pipe up to the manifolds is very important, you're get some decent gains out of that. In fact, 2.5"OD from the manifold to the tailpipe connection, with high flow cats and X pipe, will give you quite a boost in power and sound, I'd guess maybe 15HP, 10#TQ is possible.

[GA-Marauder]

IMHO, I don't think it's a good idea to mess around pulling cats. To much of a risk with emmission laws, with little (if any) payoff. High flow cats work well, and you're legal. The 2.5OD" pipe up to the manifolds is very important, you're get some decent gains out of that. In fact, 2.5"OD from the manifold to the tailpipe connection, with high flow cats and X pipe, will give you quite a boost in power and sound, I'd guess maybe 15HP, 10#TQ is possible.
Thanks, Sarge. I've already got 2.5 from the cats back, through x-pipe to Magnaflows, to my tailpipe connection. Thanks to TAF and Grand Muffler. Am considering just what you said, continuing the 2.5 forward to the manifolds, and installing high flow cats. Do I need to replace w/4, or only 2? :confused: Thanks for any info.

[SergntMac]

Do I need to replace w/4, or only 2? :confused: Thanks for any info.Two high flow cat will be sufficient IMHO, TAF will take good care of you.