Exhaust Question

[cromy85]

Just bought a used 2007 Sierra classic Z71 crew cab. Truck has plastic bedliner and thats kinda where my exhaust question comes in. If I went with turn downs after the axle how much bed resignation should i expect? My last 03 Sierra I went with flowmasters and put duals out the side in front of the rear tire. I loved the sound but wasnt completely sold on the look. Those are my two options I plan on going back to either duals out the side or dual turn downs. Anybody got any suggestions or opinions that may help my decision making process.

 

Thanks!

[Stevens03]

Welcome to the site and congrats on the new truck. I'm a big fan of Corsa, Borla or Magnaflow. And I personally like the look of duals out the rear.

[tyhuck]

x2 on the Magnaflow and on the duals. I going to hack off my Flowmaster and turndown once my Magnaflow and tailpipe get here. I hate turndowns. They make my head throb, especially in close quarters like freeway traffic. Im gonna go back with a single 3" in the factory configuration behind my new Magnaflow muffler.

[GMstrong]

Flowtech Glasspack..ha

[tyhuck]

Yeah, if you want max flow and max noise. Ive never been a fan of glasspacks because of the loud popping sound they produce. I like tone. But to each his own.

 

Spintech make really good flowing mufflers, but I dont think they are street legal.

[GMstrong]

If i didn't get the flowtech purple hornie glasspack i would have gotten the Flowtech warlock i stick with Flowtech exhaust parts.Purple hornies aren't that loud.Until you take off the cat.People hear "glasspack" and automatically think noise,popping,raspy None of which i have at all i also have the high flow cat and its very mellow,very throaty,and crisp.No poppiing or any other unwanted noises.BUT when i floor it..Its a COMPLETELY different story.

[tyhuck]

Sound is relative too. I like a nice mellow nearly stock rummble at idle, and a nice growl under load. But thats just me. I like it quiet so I can slip into the woods during deer season. I guess what Im saying is, my loud may not be loud to you.

 

Not trying to disrespect anyon or their choice in muffler or anything else. I just thought Ide throw that out there.

[Sly]

Try to add a X pipe or H pipe if you are running true duals. X pipe is preferred if possible. It will help equalize the the two banks and help with drone and the sound.

[arwriter]

Try to add a X pipe or H pipe if you are running true duals. X pipe is preferred if possible. It will help equalize the the two banks and help with drone and the sound.

 

I agree, I had an '84 K5 Blazer with a crate motor 350 in it that I ran 2.5" pipes straight back from the headers, equalized with a 1.75" H bar, 24" glass packs, and ultimately ran straight out the back to 3.5" angle cut tips. It definitely was loud when you romped on it, but it had a very nice low, even, deep tone even at idle. It was known to set off a few car alarms! The H bar or X bar made it sound so much better. A buddy of mine was also running true duals with 24" glass packs and no H or X bar and his sounded crackly and poppy at high rpms.

[tyhuck]

Ive heard that H pipes are better for low end torque, and X pipe increase top end pickup. Supposedly H pipes equalize exhaust preassure, while X pipes increase scavenging draw on each side. Dont know if its true or not.