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-   -   02 silverado - duel exhaust - good idea?? (https://www.truckforums.com/forum/chevy-silverado-gmc-sierra-forum-11/02-silverado-duel-exhaust-good-idea-10271/)

02' 5.3 Z 06-02-2009 10:07 PM

02 silverado - duel exhaust - good idea??
 
Whats up?

I have a 2002 5.3 Silverado Z71. I’m looking to run True Duels 3” Cat back, Flowmaster 44’s with 4”X24” tips straight out. I have been told by more than one muffler shop that that is not a good idea. They said they pressure of the second sensor will be off and they have had trucks coming back with problems such as, bad idling, lower gas mileage.

I REALLY want to run true duel opposed to Y, but not if it is going to screw my truck up!

-------> Does anyone have any suggestions or experiences?

Please let me know Thanks a lot!!!!!

Country

dpalms 06-02-2009 11:07 PM

I have 03 Silverado Z71 it has flowmaster catback with the exhaust coming out the side and k&n mass air ,just replaced o2 sensor after the cat on the passenger side today and it has a slight rough idle.(65,000 miles).

DamnYankee 06-03-2009 12:14 PM

You aren't making enough power to run a dual 3" exhaust.

Why do you want a true dual setup?

02' 5.3 Z 06-03-2009 12:27 PM

Thanks for the comment

I want to run True Duel because it sounds better than Y and its real, not like an imitation (hence “True” Duel). I want to run the best, money is not a problem if I’m getting good results. Are you suggesting the tone/sound comes more from the tips rather than the pipes?

DamnYankee 06-03-2009 12:46 PM

It might (or might not) sound better but you're going to lose performance going that big. You can go duals but I would keep it to a smaller pipe and just put big tips (which will give you the grumble i think you're wanting) on. A buddy of mine just dumped his by the back axle and had a 5" tip on it...actually sounded really good.

02' 5.3 Z 06-03-2009 02:56 PM

So do you think it would be safer to run 2.5’s back thru mufflers to 4” tips?

DamnYankee 06-03-2009 03:06 PM

I would probably run 2".

02' 5.3 Z 06-03-2009 04:01 PM

is that still going to give me the deep sound im looking for?

DamnYankee 06-03-2009 04:47 PM

I think as long as you have some tips on there and a decent muffler youll get what you're looking for.

RUFFNECK4LYFE 06-03-2009 06:21 PM

Yeah I second that!! These motors are not designed to run with almost no restriction on the exhaust. Think of a garden hose with the nozzle end open and water just pouring out... put your thumb on the nozzle and it pressures up but the water moves faster. Thats a crucial squeeze point!! The bends on the stock exhaust do just that. That is where you will get the most torque, especially in the low end. Free flowing, which is what you are looking at, will only cause the computer to give bad air fuel ratio adjustments. If you want sound, then 4 inch tips with a performance muffler will be your best bet to keep your power.

6mins2live 06-03-2009 10:23 PM

I am doing true duals on mine and I am only going 2.25" pipe with same size Flowmaster 40's then just dumping it at the axle (cheaper than going over). Read the "Deals!" thread for Yankees expaination on back pressure... very good post!

x148 06-03-2009 11:19 PM

Hey, i got a 2002 6.0L i got headers, two high flow cats, x-pipe, two 40 series flowmasters with 3" tubing the whole way, i only lose gas mileage cause i love the sound of my truck and got a heavy right foot. I don't ever throw check engine lights or have stalling or idle problems with my exhaust, if the exhaust place is telling you that then they are most likely a bunch of clowns, true duals is the only way to go!

kuruma 06-04-2009 12:32 AM

If you plan on throwing turbos in at a later date go with the 3 inch. If not I'd back off a little. If you don't have enough back pressure you'll sound pretty loud, but will have some pretty bad lag on take off. Don't get me wrong, you'll get the speed eventually but it'll take longer than if you went with say a 2.5 or 2 inch all the way back.

bfg112 06-05-2009 01:57 PM


Originally Posted by x148 (Post 45764)
Hey, i got a 2002 6.0L i got headers, two high flow cats, x-pipe, two 40 series flowmasters with 3" tubing the whole way, i only lose gas mileage cause i love the sound of my truck and got a heavy right foot. I don't ever throw check engine lights or have stalling or idle problems with my exhaust, if the exhaust place is telling you that then they are most likely a bunch of clowns, true duals is the only way to go!

6.0L is a lot bigger than the 5.3.... Maybe you can get away with true duals on your 6, but it's very unnecessary on the 5.3 unless you run boost.

1 fast ss 06-05-2009 08:30 PM

I wouldn't go with true duals either. Your motor is not pushing enough power. Why not get a cutout? I have two mufflers that I can inter change on my 06' SS, and there is a BIG difference from the Flowmaster super 44 with the cutout, and my Corsa sport. I've proven it at the track too. I lost 2 tenths and 2 mph when having the duals with the flow. The duals sound mean, but so would a cutout when open.

Twlman 06-06-2009 11:40 PM

Hi. I have a question on the same topic. I don't have a silverado though. Mine is an 81 scottsdale. I'm putting in a 350 bored .030 with a mild cam and a 625cfm Carter AFB performer carb and Edelbrock performer manifold and headers. For exhaust.... I had planned duals with 2 1/2 pipes to 2 1/2 cats (in and out) to a x-pipe to 2 1/2 in mufflers with 2 1/4 out to 2 1/4 tailpipes. Do you think this will work for my setup?
Thanks

DamnYankee 06-07-2009 02:09 PM


Originally Posted by x148 (Post 45764)
Hey, i got a 2002 6.0L i got headers, two high flow cats, x-pipe, two 40 series flowmasters with 3" tubing the whole way, i only lose gas mileage cause i love the sound of my truck and got a heavy right foot. I don't ever throw check engine lights or have stalling or idle problems with my exhaust, if the exhaust place is telling you that then they are most likely a bunch of clowns, true duals is the only way to go!

3" is too big for your setup. If you dropped to 2" pipe, you'd see better performance.

DamnYankee 06-07-2009 02:11 PM


Originally Posted by bfg112 (Post 45812)
6.0L is a lot bigger than the 5.3.... Maybe you can get away with true duals on your 6, but it's very unnecessary on the 5.3 unless you run boost.


Originally Posted by 1 fast ss (Post 45825)
I wouldn't go with true duals either. Your motor is not pushing enough power. Why not get a cutout? I have two mufflers that I can inter change on my 06' SS, and there is a BIG difference from the Flowmaster super 44 with the cutout, and my Corsa sport. I've proven it at the track too. I lost 2 tenths and 2 mph when having the duals with the flow. The duals sound mean, but so would a cutout when open.

You can run dual exhaust on anything, the pipe just has to be the right size.

bfg112 06-08-2009 09:37 AM


Originally Posted by DamnYankee (Post 45876)
You can run dual exhaust on anything, the pipe just has to be the right size.

I agree 100%


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