True dual exhaust or not

[98hoe]

Crawling under my new hoe this weekend I noticed it already has dual pipes, dual cats, and into one muffler. Performance wise would upgrading that system be better than running two mufflers? I know I could get like a "2 in 2 out" and have two pipes out back. Or would a true dual exhaust give me more??? Also I'm on the fence between the 40 series and 50 series HD Flowmasters for my truck. Looking for specific Tahoe experiance. Not what I can read on other sites. And if you have a Borla system or something and just love it I would like to hear it. I just want something beefy, turn your head when it starts kind of sound. Like damn that sounds good/mean. Any help would be great.

 

[treepete]

I struggled with this question, and most told me that the performance vs additional cost/ pain in the a$$ was not worth it. I wanted to try it though, but my budget at the time was tight.
I think to successfully pull it off, you may want to get the whole setup by made by a muffler shop. The best motivator for these dudes is money, and if you say you want true dual all the way back, they can make it happen for you. The guy I used asked me about dual out the back, and I went for the side outs instead (out of a 2in-2out flowmaster 40) and its great.
I bet you can either stagger 2 mufflers somehow, or possibly use some sort of thinner, tubular muffler and sound totally mean.
Look up all of exhaust posts here. Combined, you'll be able to make your decision.

 

[clean95]

i don't know alot about dual exhaust... but i do have the flow 40's with header back 3inch single exhaust because at the time people told me u get more hp out of single better back pressure i don't know if thats true or not... but its for sure loud and i have it commen out of the muffler then a turn down no tip out of the side or the back and it sounds good and when ur hard on the accelerator like me ur noticed people that don't see my hoe and just hear it from a distance think im a pumped up mustang or something... but a muffler shop will fab up anything u want and the more bends or different tubing sizes they use will have a affect on the sound...

 

[Mike97]

I also wondered about this when I owned a 97 K1500 with the 5.7L vortec engine. It had the same exhaust as ours. At that time, Banks made an exhaust for the 96 - 98 vortec. It was a similar setup with two cats and two pipes going into a single muffler with a single outlet. Their FAQ addressed this. According to that site, that setup gave better performance with the stock ecu settings. It stated that you may actually lose power if you dual it all the way back.

 

[tps97]

I also wondered about this when I owned a 97 K1500 with the 5.7L vortec engine. It had the same exhaust as ours. At that time, Banks made an exhaust for the 96 - 98 vortec. It was a similar setup with two cats and two pipes going into a single muffler with a single outlet. Their FAQ addressed this. According to that site, that setup gave better performance with the stock ecu settings. It stated that you may actually lose power if you dual it all the way back.

They are right. Backpressure (from a certain exhaust design) is needed for proper 'scavenging', the spent fuel being drawn from cylinders. Too little backpressure, and you don't clean the cylinder, same as too much (simplified explanation).

Tim

 

[96ProCompTahoe]

you'd be suprised what will give you the best performance. my 86 camaro has the best performance with regular dual cats, into a single muffler. true duals suck all the power out of it, won't even smoke the tires....

asked the guy at the local muffler shop about exhaust on the tahoe and was told my best bet was to run duals off whatever muffler i chose (flowmaster super 40, 2 in 2 out) instead of true duals. the muffler also acts as the H or X pipe.

 

[treepete]

So is there any way to modify the ECU settings then if you put on a system that has less backpressure?

How can you measure backpressure, anyway?

 

[tps97]

So is there any way to modify the ECU settings then if you put on a system that has less backpressure?

How can you measure backpressure, anyway?

Sheesh. I'm not sure anymore. I'm going on training from '78. I actually understood the design concepts of cylinder head design, valve angle, lift and duration, and intake and exhaust for maximum scavenging, which almost always entailed some air/gas mixture flushing out the spent gases into the exhaust, thus the emission problems. I'm sure someone here may have a clue. I can't be the only 'old-timer' around...

 

[peckmv]

my muffler experience

I talked to a ASE mech and he said you really don't benefit from true duals. He said that by the time the exaust gasses get to the muffler, that those gasses have cooled down enough to void any benefit from duals. I had a flowmaster and it rusted out in two years. I was not impressed. I did a lot of research and settled on Magna-Flow. A two in - one out single SS muffler. I have been very happy with this setup for over three years. I tow a boat into the mountains and I found headers to give me an actual performance boost. The Magna-Flow sounds good too. Hope this helps.

 

[98hoe]

Thanks for the replies. I am going to go with a single muffler now with a 2 in 2 out. I just like the looks of two straight pipes out the back. The $ saved on the second muffler will prob. go towards headers or cold intake. I just want my hoe to breath with wide open lungs

 

[2000 Z71 Tahoe]

i dont have a sound clip for you. i really wish i did though. anyway i have true duel exhaust on mine. i have herd if you have a cross over/H-pipe that you may get more power. but at the same time it really changes the sound if you have a cross over pipe. (muffler acts as a cross over if you have 2 pipes in and 2 pipes out) me personaly i love the lag time noise that my truck puts out between each side. i did not put flowmafter or anything like that because of cost. i put glass packs on mine.