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Originally Posted by bluemax_1
Kewl. Were those airflow differences measured vs stock ATR dual or single shot? And aside from weight, do you know of any airflow differences between the ATR dual and single? I got mine from DR when it went on sale about 2-3 years ago and I figured at the time, if Matt could hit 10's with it, should be enough for me. Don't think anyone else really had something that was proven to be better back then (that I was aware of anyway) aside from maybe the crazy 4"(or was it 4.5") JIC (Pitroad?) full titanium that cost and arm, a leg and left nut. Super light and big enough for a cat to crawl into but uh... money better spent elsewhere.
So you guys just got a shop with a mandrel bender to put the 30 degree bend in a pipe and tacked on any muffler you liked? Interested to see where the bend is. There's not a whole lot of room to route the pipe under there.
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I don't know the exact data. The figure above is what my friend quoted to me after testing it himself (I wasn't there).
This exhaust formula isn't exactly revolutionary. Any of the big Supra exhausts have one bend near the back, then leave the muffler to exit at an angle. The bend goes at the back under the rear suspension. You may have to bend slightly off the downpipe if you're running an ATR and don't want to reconfigure the downpipe to shoot straight back.
This isn't just a mandrel bend, either. It's straight tube rolled so that it has a center line radius that a mandrel bender can't do. It's not the most critical part, but there are lower losses through a larger radius bend. This exhaust plan takes that to the extreme.
-Chris