[RockyMtnRay]

Originally Posted by seacopper

I'm like the rest, want to save money, but add a little torque. I read a lot of what you say and what I have boiled it down to is this, JBA Headers and a Gibson SS muffler for both torque and horses vice dual exhaust for my 05 Tundra V-8 DC. Can you recommend a size for the Gibson and also how does the Magnaflow compare? Thanks.
Seacopper

Strongly recommend the longest model with the 2.5 inch inlet/outlet. That would be SKU 788500S in stainless (drop the S from the end for aluminized). Recommend the stainless for a bit heavier gauge metal that won't rust out and is less likely to have drone. Dimensions are 2.5'' X 2.5'' offset inlet/outlet, 6'' diameter, 24'' body, 30'' overall length (it's a bit smaller in diameter, but actually a tad bit longer than the stock muffler). Gibson mufflers use a parallel internal perforated tube design...the long case allows the most area for gas transfer between the perforated tubes and thus the lowest muffler backpressure (also the most sound muffling). Gibson sells shorter designs but I strongly recommend against buying one if towing and torque are the objectives.

Magnaflow is a totally different design...basically a relatively quiet glass pack type muffler. Probably about equal on performance gains but likely to be a lot louder than the Gibson at high throttle openings that are typical when towing. Magnaflow mufflers are a typical "performance" design...the more you open the throttle the louder they get. Great for regular/spirited driving; not so good for hours of towing, especially hours of mountain towing. The reason I (and many others) promote Gibson mufflers for towing is they stay pretty quiet at high throttle openings yet give a very decent mid range torque boost.