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  #16  
Old 02-10-2010, 03:58 PM
West West is offline
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Everybody has their own opinion on this matter. To stay legal you would have to have them on there. You can try rockauto.com for some replacement bolt in cats.

Bigtt8600- those code don't neccessarily mean that your cats are bad. It could be several things that triggered the code.
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  #17  
Old 02-10-2010, 07:57 PM
Sasquatch Sasquatch is offline
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okay cool. in utah it's legal with just one but can't figure out if i'll burn up or not with just on. thanks for the suggestion to find some cats. I also know my front one is bad because of the noise it makes and the horrible fuel milage
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  #18  
Old 02-13-2010, 08:34 PM
BigT8600 BigT8600 is offline
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Quote:
Originally Posted by West View Post
Bigtt8600- those code don't neccessarily mean that your cats are bad. It could be several things that triggered the code.

Beginning to wonder myself. My problem is, how do I know if its definetly the cats or not. If my cats were bad, wouldnt I be experiencing some kind of problems like a rough idle or sputtering or bad performance?
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  #19  
Old 02-14-2010, 01:42 AM
knightmare1015 knightmare1015 is offline
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Basicly it depends on the year and engine of your ranger. removing the cats for better ones is great but getting rid of them entirely is very very bad. Basicly it will shoot codes and the engine does need the cats to function. I would go with the high flowing Magnaflow cats for better engine performance and you'll keep it legal. Alot of states are going to start emissions testing real soon (My state already does, VA). Also places like CA,VA and NY that require an annually inspection won't pass it if you remove the cats. Basicly you need to check your local and state laws before attempting this mod.
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  #20  
Old 02-23-2010, 12:00 AM
jester jester is offline
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Quote:
Originally Posted by bigtt8600 View Post
Beginning to wonder myself. My problem is, how do I know if its definetly the cats or not. If my cats were bad, wouldnt I be experiencing some kind of problems like a rough idle or sputtering or bad performance?
Not necessarily. I had a Honda that ran great, then i took it in for emissions and they told me my cat was bad. i would never have known if it wasnt for that stupid emissions test
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  #21  
Old 02-24-2010, 11:26 AM
Nitrofan1 Nitrofan1 is offline
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All vehicles react differently to this issue. Less back pressure is good but almost no back pressure is bad in the long run. Our engines were designed to have back pressure. Course all manufacturers design the tightest restrictions to meet EPA standards. A full flow exhaust in the long run would cause faster wear on the engine. The best option for: MPG, valve longevity, meeting EPA standards and well happy neighbors (loud exhaust) would be to put cats back on. The O.E. units aren't as restrictive as you might think. Ford does a respectable job due to Ford's reputation for torque vs horsepower engines. If you want more power and less back pressure I'd recommend going with the Magnaflows. They will meet any exhaust standards, you will pass emissions testing if you have it and less restrictions of the Maganaflows will mean a better running truck.

Hope this helps!
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  #22  
Old 02-24-2010, 11:37 AM
js250 js250 is offline
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how would my truck sound if i took the muffler off and and y pipes ran dual pipes out if the back? with two tips the what my bro has on his 4.6 f-150 and it sounds mean? would mine sound like shit?
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  #23  
Old 02-24-2010, 12:56 PM
2007BlackFX4 2007BlackFX4 is offline
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I have 2 cats that are right next to the engine and then pipes all the way out from there with no muffler. it is quite loud and some what obnoxious but i like it. it sounds very deep for a V6...
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  #24  
Old 02-24-2010, 01:27 PM
js250 js250 is offline
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yeah i only have a little 4cyl my best bet is to keet it quiet... or look and sound like a *******
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  #25  
Old 02-24-2010, 01:48 PM
90fordranger 90fordranger is offline
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take them off, an wen ever you see a cop let off and coast. lol.
i had my old 6.2 straight piped, though it didnt have cats. but every time i saw a cop id coast by never got stoped. =]
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  #26  
Old 02-24-2010, 01:49 PM
Nitrofan1 Nitrofan1 is offline
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Well, it all depends on what you think sounds good. The smaller the displacement, the tinier or buzzier you'll sound. 4 cylinders can sound good as long as it's done right. In your case my opinion is it wouldn't sound that good unless you have the power to back it up. There are a lot of 4 cyl vehicles out there that sound so silly and are made fun of. If you say drop a Turbo Coupe motor in it and have the power to back up the sound then you would be justified. You best bet is to work on the engine power then the exhaust. I have seen (and jumped on) too many beer can sounding 4 cylinders thinking the must have some power when all they've done is make a loud obnoxious car.

Again, it's your Ranger. Do what you think will be a good sounding truck.

P.S. The true duals will do nothing for performance by themselves.
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  #27  
Old 02-24-2010, 01:56 PM
Jp7 Jp7 is offline
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Quote:
Originally Posted by bigtt8600 View Post
I've got a similar situation. Check engine codes tell me i have 2 bad cats...It says they are "low efficency." I have googled this a lot and come up with a lot of mixed answers. Some say its great to take them off and others argue that it reduces back pressure which the motor needs in order to run correctly...Still haven't got a solid answer.
Here is a solid answer

Back pressure is the enemy, but it is required to keep the gases flowing fast (which is good)

Ideal system has low backpressure, but fast laminar flow. This can't happen at all RPM with a real life situations.
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  #28  
Old 02-24-2010, 02:04 PM
Jp7 Jp7 is offline
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Quote:
Our engines were designed to have back pressure.
your engine was tuned with backpressure, not designed to have backpressure. Big difference.
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I'm dying to see this at night. Someone go tell the sun to give up already.
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Originally Posted by beef08 View Post
Your the man, you bring our dreams to a reality within the lighting spectrum
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Jp7 you always do AMAZING work! Hats off to you sir
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  #29  
Old 02-24-2010, 02:48 PM
alabamafrog alabamafrog is offline
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My 94 4.0 has around 200,000 miles and I figured that the cats had to be getting clogged so I removed them and looked in with a flashlight, they were extremely clean, looked like brand new. I already had it off so I couldn’t help myself but to beat all the crap out of them to create 2 empty shells than I put them back on. So in effect now I have a straight pipe to the factory muffler. If someone looks under the truck they will see the 2 stock cats and stock exhaust system.
There is no noticeable difference in power or mileage, she got a consistent 21mpg before and after and that’s with me stepping on her pretty often and driving aggressively.
The only difference is now she has a deep throaty sound but still pretty quiet. The only time I notice it is when I step on it.

Last edited by alabamafrog; 02-24-2010 at 02:52 PM.
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  #30  
Old 02-25-2010, 02:18 PM
knightmare1015 knightmare1015 is offline
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Quote:
Originally Posted by js250 View Post
how would my truck sound if i took the muffler off and and y pipes ran dual pipes out if the back? with two tips the what my bro has on his 4.6 f-150 and it sounds mean? would mine sound like shit?
Basicly it depends on what size motor you have as well as the type of Camshaft, and Valvetrain components.


Quote:
Originally Posted by Nitrofan1 View Post
Well, it all depends on what you think sounds good. The smaller the displacement, the tinier or buzzier you'll sound. 4 cylinders can sound good as long as it's done right. In your case my opinion is it wouldn't sound that good unless you have the power to back it up. There are a lot of 4 cyl vehicles out there that sound so silly and are made fun of. If you say drop a Turbo Coupe motor in it and have the power to back up the sound then you would be justified. You best bet is to work on the engine power then the exhaust. I have seen (and jumped on) too many beer can sounding 4 cylinders thinking the must have some power when all they've done is make a loud obnoxious car.

Again, it's your Ranger. Do what you think will be a good sounding truck.

P.S. The true duals will do nothing for performance by themselves.
I agree with most of what you said. the trual duals is a different matter. It depends on the senario. Yes they've been known to help on certain vehicles and models but not always. Strait pipes on a 4 banger will NOT sound good on a "stock version". it'll have that poed hornet/fart can sound to it. Basicly he'd have to have the heads rebuilt from the ground up and switch camshafts to get the sound he's looking for. Then you'd do the exhaust. Flowmaster Deltaflow 60 series muffler would be great. They're designed specifically for 4 and 6 cylinder engines.


Quote:
Originally Posted by Jp7 View Post
Here is a solid answer

Back pressure is the enemy, but it is required to keep the gases flowing fast (which is good)

Ideal system has low backpressure, but fast laminar flow. This can't happen at all RPM with a real life situations.
it depends on the situation, where you live and your states emissions requirements.

Quote:
Originally Posted by Jp7 View Post
your engine was tuned with backpressure, not designed to have backpressure. Big difference.
You're partially right but you also forgot about one small ugly detail. THE EGR VALVE. when they installed that shit from the factory they pretty much permanently choked it. If you remove it your vehicle won't even turn over. If it takes a dump, that's where you sit. It took them several years to figure out that is was indeed a bad move but they finally got rid of the shit.

Quote:
Originally Posted by alabamafrog View Post
My 94 4.0 has around 200,000 miles and I figured that the cats had to be getting clogged so I removed them and looked in with a flashlight, they were extremely clean, looked like brand new. I already had it off so I couldnít help myself but to beat all the crap out of them to create 2 empty shells than I put them back on. So in effect now I have a straight pipe to the factory muffler. If someone looks under the truck they will see the 2 stock cats and stock exhaust system.
There is no noticeable difference in power or mileage, she got a consistent 21mpg before and after and thatís with me stepping on her pretty often and driving aggressively.
The only difference is now she has a deep throaty sound but still pretty quiet. The only time I notice it is when I step on it.
That's what type of exhaust you want. I've been in trouble with my exhaust too many times and know pretty much what I like, what works legally and what's illegal. Strait pipes are not illegal to have but are illegal to run (a local judge told me that in open court).
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