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I don't know what you mean in saying that there is no such thing as backpressure. You can think of it as restriction, or limiting smooth UNRESTRICTED flow. Anything that limits flow can be considered backpressure. And I'm pretty sure the stock turbo muffler has baffles and creates backpressure, FWIW.
My experience thus far has been as such:
My car with a single cherry bomb installed right after the header was loud. I know that when i added a baffled "performance" muffler(probably one slightly similar in design to the stock turbo muffler) my car idled better and had more power and was smoother in the low rpms(under 2.5k). As far as my car having less top end, i'm not sure, possibly yes, but maybe not. I didn't really think about it or compare it when i switched, but there was a noticeable difference in the lower rpms. A difference for the better. Being that my car is carbed, i think possibly the lack of low end power might be less exagerated in a FI car, but that may be bogus.
From what i've read over the years, and gathered and what not, is that backpressure is pretty much bogus and an "old rodder's tale". I've always wondered what those "Lakes Pipes" were for and how they worked... Other than looking cool of course. From what i've personally experienced, it is not fully bogus, but i can't comment on high rpm performance, which is where it makes sense that it would limit the engines capabilities. I'm biased toward wanting my car to have a dual perforated core muffler system, where one is like my cherry bomb, just a straight barrel with a perforated pipe on the inside for the exhaust to just go through and the sound waves to be absorbed by the material outside of the core, and then a larger muffler of the same perforated core, straight through design but with a larger area for absorbing sound. That would be what i want in an exhaust for an NA car. For a turbo car, same thing if you want it quieter, otherwise just one resonator(cherrybomb pretty much...).
Recently, i've seen some people talking about how backpressure is necessary again, and all that other good crap. Who knows? It seems it's all myth these days. And then sure, you can think of it this way(these are not facts, well, not that i know of, but they make sense), straight through is good for higher rpms, and some backpressure is better for lower rpms/around town driving/traffic crap.
My bunch of two cents... :-\ Peace,
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Kyle - attending Ore. State, while my lil '68 142 (256k, 74 b20, m40, iPd bars, other misc... =D) waits for its next outing... (My Cardomain site)
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