Not to quarrel but you can also throw lap times out he window with an over powered light switch type engine, and I don't just mean low end, all through the rpm range...

I don't know anything about that....I guess if someone buys a drag engine and sets it up with stock gearing on a slippery track there may be an issue....... but taking a stock or near stock Elite 5 and putting on a 9853/41001 isn't going to make it some tire spinning monster that uses its fuel tank in 5 minutes..... coming from a 2096/41021 its going to give the engine a stronger feel throughout the powerband with a noticeably better top end run out and about the same fuel mileage..on a track needing more power it may even get better mileage.... If your having trouble handling a stock Elite 5 with a 2096/41021 then you probably wont want to go to one of the better performing 2 chamber pipes....but if your like some guys and the 2096/41021 isn't enough for you then you can easily find more power with just a basic pipe and manifold swap....

The more air you flow, the more fuel you flow. There's no way around it.

But when the more airflow pipe set makes more power you pull less trigger limiting the airflow at the carb = same mileage. Simple solution for such a simple statement.

Not true on loop scavenging 2 strokes ! a huge amount of power is created by how efficiently the pipe can recycle mixture that has already blown thru the engine into the exhaust, power and efficiency are actually quite intertwined... the most powerful setups usually are using the fuel most efficiently ..

Hey, great on paper. But someone who is noodled and lacks throttle control won't pull less trigger.

So then you agree with Neil it's all about driver control.

The pipe restriction is for noise ordinance and fuel economy for the environment... people will say what they want, but having one less thing to focus on (trigger) while driving will make you a better driver...

Furthermore more US drivers are not bound to that rule during their Local events, such as roar Nats, but yet they will not run these "power" pipes on their engines, the cars are over powered to say the least and making the car drive able is the main objective...

World champion drivers use these pipes and smaller inserts, what wins on Sunday sell on Monday..

Well yes and no, it is a bit more complex than that.
When you modify an engine, and you do it right, you improve on the engines effiiency... That means more energy out with the same amount of energy in as before the modifications were done.

All I know is the same crap was said about the 2058 a few years back when I was recommending it on almost every engine...... a Few years later the 2058 is now accepted as one of the best all around go to pipes... Even when pro's try the 2058 they like it...so much so one even had his own pipe modeled after it..... RC racing is as much or more about fads then it is about anything else... 10 years ago these new pipes rules came it changed the pipes these racers run, to the point I doubt many of todays racers have even tried a 9886 or 9853........ Sure going to be interesting once they do ! and realize the 2058 was nothing next to the 9886/9853 ! all the things people like about the 2058 these pipes do even better !

Also there is no proof anywhere that the EFFRA legal pipes get better mileage, in fact I would suspect they get worse mileage....choking the exhaust is not a way to make any engine more efficient, choking the exhaust actually makes them work harder for the power they produce ! In fact many of the guys who have taken my pipe and header advice have found themselves getting better mileage along with the increased performance !

So if you guys want to run noise restriction pipes for no reason then so be it, but I am going to continue educating the racers about what is what and why these pipes are being recommended over the older pipes as it has nothing to do with anything but reducing noise, power and RPM !

Three chamber pipes have more return pulse/backpressure
Hsn setting needs to be leaner to gain power from these pipes
Leanerererer settings equates to more better fuel economy

They have more backpressure but less return pulse.. the increased back pressure causes a higher tank pressure and subsequent increase in fuel supply which requires a slight leaning of the needles so the mixture inside the engine remains the same even with the leaner needle settings......A 2 chamber recycles the spent fuel better and even with no more airflow passing thru the carb the 2 chamber makes more power hence it uses fuel more efficiently......Both setups doing equal work the 9886 will get better mileage then a 2096

leaning a engine i would add ,its good for champions and team drivers that they are only 1 or two per cent ,also leaning an engine would decrease the life span of the engine,.....with all the respect and agreed with maximo and huston i would say that the rules ,,some new rules are killing the adrenaline of rc nitro action ...... so i would prefere to lose a race ...instead of loosing the joy of the 9886 noise ,,the stupid reaction of big venturies even 9 mm venturies .

Leaning for crazy power n extra seconds for sponsored drivers are standard practice but if you willing to spend then just do it. I'm happy with good tune and lasted more gallons...

some rules are silly such as displacement limits.....like seriously does anyone believe a 32 would be a unfair advantage in a pro level offroad race ? .... ultimately the rule prevents the manufacturers from even attempting to develop a higher tech big displacement engine and sadly creating a larger gap between the racers and bashers then there already is...At a time when Nitro really needs some new development more then ever we have these rules that focus on noise restriction..Nitro is at a 10 year low and its still continually losing ground..I can name several areas where rule changes caused a reduction in race attendance , one of them by a simple name change of a class resulting in the catastrophic loss of a common bridge between bashers and racers . Same deal with dynamic adjustable pipes, there is a whole new technology that could be developed that current race rules wont allow due to potential noise issues... Being a former track owner I can say the only noise complaints we had were from our PA system, never from the engines.