Edit..

I have a little more time LOL

So in the testing I have done it shows that the manifold plays a huge part in engine performance and efficiency so much so that in many ways the manifold choice is more critical then the tuned pipe itself and just a simple manifold change will often have a much more dramatic effect and noticeable effect then changing the tuned pipe would. Armed with a Novarossi 9853/9886 a person could optimize performance on any current nitro engine on the market by just swapping to the appropriate manifold... And when i say optimize I mean optimize, where performance would be measurably better across the entire powerband vs even the very best current factory recommended EFFRA approved pipes... Simply by swapping between 410019,41032,41021,41033,41005,41001,41031 you can tailor those 2 pipes to sync with any engine you wanted and you would never need to buy another tuned pipe ever again no matter what engine brand you decided to run, or even what sized engine you wanted to run , anything from a 0.19 to a 0.32 can optimized with these pipes mated to the correct manifold... Typically the lower timed and mellower the engine is the longer the manifold it prefers, and the higher timed and more aggressive an engine is setup the shorter the manifold it wants, the higher the exhaust timing the is the shorter the manifold needs to be....... When you try to put a short manifold on a low timed engine you slightly raise the RPM where peak power occurs but at a loss of torque and narrowing of the powerband... and when you try to put a long manifold on a high timed engine the RPM drops where peak power occurs but it loses torque and the powerband narrows...

* 9901 is a very versatile pipe as well, doesn't make peak power quite like the 9886/9853 but with the right manifolds its not far off.... on a 41033/41001 this pipe can be beastly on many engines
* 2096 mates well with 41021, out of all the pipes I have tested this one seems to thrive above all others on the 41021...on all the Nova's I have tested the 2096 will outperform even the 9853 and 9886 when they are all mated to the 41021....for some reason the 41021 doesn't play nice with the older 2 chamber pipes whereas the 2096 is at its best ... Also the 2096 doesn't respond nearly as good to manifold changes as does the 9901,9886,9853, it seems to exclusively like only the curved manifolds with the 41021 being the most favored..