Dual Exhaust for 8.1

mityike · July 28, 2005

I have the 8.1 ECSB and want to add the dual exhaust, with the angled side exits near the rear. I dont want any cab noise, but would like a little performance. Any recommendations? Thanks. Also, any pics of this setup would be nice.

Z71-cummins · July 29, 2005

Hey man i say flowmaster. They have some nice mellow sounding mufflers that can make your ride go. But i bet some guys will tell you to get magnaflow its whatever your preferance is. I have dual exhaust flowmasters on my 5.7 but not angled, angled will give a nicer and louder sound.

agoody68 · October 24, 2005

Use a flowmaster 70 series.

3500in nc · October 24, 2005

you can always use the 40series and a set of earplugs will give u the sound u want

but the 70 series is a nice sounding muffler but i would also put in a xpipe to cut down on the raspyness of the 8.1l

hope this helps ya

Supercop8100 · October 24, 2005

im going to have twin flowmasters on mine in a couple of weeks, 70 series, and i'll let you know how it turns out.

mityike · October 25, 2005

Thanks for the help. I like the side exits better than the straight through, and I do like the deep tone, but dont want anything annoying or overbearing. I travel alot on the road and think the cab resonance that some people complain about would drive me nuts. Whats the benefit of the xpipe? Also, I assume the duals will also be 3" pipe, which in my opinion gives the truck a heavy duty look!

3500in nc · October 25, 2005

this is a quote from a Dr.gas.com

In Sync ...HUMM...

The Dr. Gas® Crossover

Remember that radio and TV commercial about the piston engine going "Boing-Boing," when it out to go HUMM? Well, all V8 engines with 90 degree cranks, have an out of sync imbalance in their firing order between the right and left cylinder banks. Yes, they do go "Boing-Boing." The firing order imbalance is a necessary sacrifice for dynamic balance of the rotating and reciprocating crank, rods and pistons. Each time the firing order is completed (two full revolutional), two cylinders within each bank will fire and exhaust within 90 degrees of each other. These two cylinders will be exhausting into the header collector or exhaust manifold almost simultaneously. This overlapping condition creates a lot of back pressure and a pop sound. Meanwhile, the opposite exhaust manifold has no activity (or pressure) in it at all. This is where the characteristic, low harsh popping V8 sound comes from.

The most common way of reducing this out of sync imbalance is with rebalancing crossovers such as H pipes and over-and-under X style crossovers. These provide both noise reductions and efficiency (power) improvements. H pipes are effective only at low and mid range. The over-and-under X crossover works a little better but still does not completely rebalance the exhaust at high RPM.

Dr. Gas, Inc. has developed a new generation of crossovers that uses a tangentially siamese junction, in place of the H or over-and-under X. It evenly splits, smoothes, and synchronizes exhaust pressures at all engine speeds. The high and low pressure pulses in the two pipes are evenly imposed on each other, leveling out the pulse time history pressure differences between right and left cylinder banks. Re-synchronizing the exhaust pulses reduces back pressure, cancels sound, and provides additional scavenging. Tests have sound 6 dBa (75%) reduction in sound levels, and increases of 10 to 30 hp, and up to 40 ft-lbs. of torque! Economy, and throttle response are improved. Exhaust flow after the crossover is completely smoothed out. The job the headers started is finished.

yes its long reading but it has the info on xpipes