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Originally Posted by Verndog
With 2 1/2 pipe there are noticeable losses by some people, with 2.0 and 2 1/4 many many people testify no noticeable loss on the low end, and definate gains above 3000RPM. I am one of them. I would give up any other mod I've done before my dual exhuast....including the unichip that was a big performance gain....The truck a (V8) is meant for dual....it's that simple  |
Your system is one of the exceptions I was thinking of when I wrote "nearly all". Certainly, a
custom dual system like yours that has a properly located H-Crossover (or even better, X-Crossover) and exactly the right components including mandrel bent tubing usually can avoid low-end torque loss and will get improved torque in the higher RPMS. Although I gotta say, you might have done even better in the sub-3000 RPM range with the 2 inch pipe that was recommended by, IIRC, V8Toilet (and others) at the time you had your system designed/fabricated.
However, my remarks were targeted toward the typical folk like our original poster who buy an off-the-shelf "system" that simply replaces the stock muffler with a single inlet, dual outlet muffler (whether it be Flowmaster or TRD) and has dual 2.5 inch (or larger) pipes to the back of the truck. And when it comes to
those off-the-shelf "systems", I'll stand by my statement that low end torque loss is all but guaranteed.
You are indeed proof that if someone wants to invest time, energy, and enough money to have a knowlegeable performance shop craft a custom crossover system, good to very good dual exhaust performance can be obtained. But most folk don't have that time, energy, or money...and won't get good performance from a bolt-on, off-the-shelf system that basically just replaces the stock muffler and single tailpipe with dual post-muffler tailpipes.