One Last Exhaust Question

[Tweeter400]

I have scheduled my truck to go in Friday for dual exhaust, but I don't know if I should go w/o mufflers or go with Flowmaster 40. The guy told me most of the back pressure is created by the cat, so there would be no performance increase between the two. So my question is which sounds better and is he correct??

[vortec4800]

So loud... Do you really wanna listen to that on the highway?

[Stomper]

Go with stright pipes. I had a 40 series Flowmaster on my 5.3 and it wasn't very load at all. I have stright pipes on my 99 GMC 350 from the cats back and it sounds great. If it is to load its not hard to add a muffler later. :thumb:

[Tweeter400]

The loudness doesn't bother me, I actually have dynamat in the cab so I am hoping that will help. What I am concerned about it losing backpressure with no mufflers. Is this a problem? Will going to a smaller pipe then to a larger pipe at the end help? This is what a midas shop told me?

Please help, everyone has different thoughts!!

[bcfitzsimons]

You know, I may be wrong about this, but supposedly (I think this came from HOT ROD, but I'm not positive) the biggest influence on back pressure is when the pipe turns 90 to cross over the rear axle, and then 90 degrees, and then 45 degrees to continue out the back.  It's not the muffler-

 

Just my 2 cents-Fitz

[BDBWTE]

Straight pipe=lack of low-end torque and bumping your torque curve up about 500rpms..

 

But it will sound sweet..my 1500 has straights but the 2500 needs to pull so muffler it is.