Does Dual In Dual Out Make A Difference?

By ezskanken
December 28, 2009 in Advanced Drivetrain, Suspension & Tuning

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ezskanken

Posted December 28, 2009

Hello,

I just bought a 05' crew cab and was thinking about my next set up. I have a 3" SI/ 2.5" DO w/ SS style exit and rolled 4" 45'd tips on a Cherry Bomb Vortex. I love that bassy, thoarty, deepness it gives off in idle and in action. I was thinking of going with a 3" SI/ 3" DO w/ SS style exit and rolled 45 tips on the crew cab to get a little louder. I was just wondering if 2 pipes going into the muffler and 2 coming out would enhace the sound of it all. Both trucks have the 5.3L Vortec and K&N intake systems. Anybody got some ideas? I went down to my favorite muffler shop and he said $399 out the door for the 3" SI/ 3" DO, tips not included. Good price in my opinion. Just looking for some input, thanks everyone!

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Posts
- Brand new to this forum. Questions about re-gearing my 26’ HD
  
  By chris21 · Posted 50 minutes ago
  
  I'm pretty sure it doesn't actually recalibrate the speedometer it just changes the wheel speed sensor inputs to the computer. The truck still thinks it has stock tires.
- OCI, not when but why?
  
  By asilverblazer · Posted 53 minutes ago
  
  I apologize, I missed this post, at risk of going off CURRENT TOPIC. I'm not saying it is BS, I'm questioning how much information is being held back. GM is NOT going to spell out exactly every parameter in the algorithm. Liability, intellectual property, etc. I'm not naive enough to believe that it is as simple as revolutions, coolant temperature, miles, time; are you? I don't do irrational either, and boiling the OLM down to four simple values that I could code in an afternoon (I'm not a coder) is irrational - unless it suits your agenda to ignore it.
- Brand new to this forum. Questions about re-gearing my 26’ HD
  
  By BDS my HD · Posted 1 hour ago
  
  Chris 21 I appreciate your constructive response. !! 😉😉😉 The 6.6 is gas. Correct me if I’m wrong but by recalibrating the speedo you’re correcting the shift points of the transmission on these trucks.?.
- Brand new to this forum. Questions about re-gearing my 26’ HD
  
  By newdude · Posted 1 hour ago
  
  That is a huge misconception. Bigger does not always equal safer. Modifying does not make it safer either, with exceptions. Think of this. Your truck in stock form is capable of emergency maneuvers, proper stopping distances, its handling is designed around the factory wheel/tire packages, etc. 37s and a lift? Now you've affected your braking distances, handling and ride control. You've raised your center of gravity higher. Your front visibility is now obstructed more than stock, same for your rear. Does it look cooler? Yes. Does it now work as good as it did from factory on road? NO. As for my mention of exceptions? Say you had a sedan or crossover. They typically come with all season tires. If you swap out for a performance all season or a summer tire, you improve your car by lowering its stopping distance (better braking because of traction) and improve the handling (regular and emergency) of the vehicle. That is an actually improving modification. My old 2019 LD 1500, I ran UHP all season tires on 20in wheels in a factory offered size. It improved all aspects of how it drove over the Duratracs it came with from the factory in the stock 18" tire.
- Brand new to this forum. Questions about re-gearing my 26’ HD
  
  By chris21 · Posted 2 hours ago
  
  37's would probably fit with a 3" lift. GM only has two gear ratios for these trucks 3.73 for gas and 3.42 for diesel. And they can't be programmed for anything else at the moment. The rough country module just corrects the speedometer and odometer to adjust for tire size it's not a programming device. You haven't said if your truck is gas or diesel, but for a gas truck the 10L1000 with 3.73 gears has a lower final drive ratio than the 6L90 it replaced would if it were swapped to 4.10s. GM used the same 3.73 gearing in 6 speed gas trucks. I don't think you'll have any issue running 37's with the 10 speed other than the reduction in mpg and towing/weight capacity which is as much of a function of the lift as the tire size.
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