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Originally Posted by RockyMtnRay
Nearly all catback dual exhausts (regardless of brand) are going to at least somewhat hurt your low end torque. The problem with dual pipes (unless they're real small (like 1 and 7/8 inch diameter or smaller) is they let the exhaust gases slow down and cool down much more than the stock single 2 and 3/8 inch pipe. When the exhaust gas cools and becomes stagnant, it gets dense and acts like a plug that has to be pushed out by incoming gasses from the engine.
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Although this is true in theory, so is driving with your windows down effects aerodynamics and hurts performance. A lame comparison...true, the point is just because something in theory is true, it doesn't mean that it will be a noticeable.....or a better word....
a SIGNIFICANT difference.
Also...don't be fooled into thinking it's just pipe dia, the pipes wall thickness, the type of muffler, the quality of bends in the pipe, all play a role in exhaust flow....even the tips.
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
Oh...BTW....forget about flowmasters....do yourself a favor and go with magnaflows...I've tried both...and IMO no comparison.
Here is a listen (please excuse the dyno fans) .These are absolutely quiet on the road (unless you really get on it).
http://www.ppdbillet.com/images/Unic...une/Dnyo_1.AVI
Kevin