Answering your questions:
1.- Going to non conical header will make fuel savings, but in the order plus or minus half a second at the most.
2.- Number of fins will depend on what you´re looking for...shorter more top end...longer more low end
3.- Make sure you have the 2660, because there is the 2630 which looks the same, but used to be a fuel guzzler, that is why they came out with the 2660
4.- Probably numbers have faded out, but new have clerly printed numbers.
NOVAROSSI HEADERS
NR2615 CONICAL SHORT 5 FINS
NR2616 CONICAL MEDIUM 6 FINS
NR2617 CONICAL LONG 7 FINS
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NR2618 NON CONICAL SHORT
NR2619 NON CONICAL MEDIUM
NR2620 NON CONICAL LONG
CONICAL HEADERS obtain maximum peak power of an engine, but greatly increase the fuel consumption.
NON CONICAL HEADERS give a little less power, but reduces fuel consumption.
AFM
Thanks again for the info.
Just to clarify,
how much fuel saving do you get from the
5 Fin to 6 Fin and
Conical to Non Conical.
Are you saying save 1/2 a second of fuel a lap?
I will buy a six fin manifold as Id like to try more bottom end torque at my track.
Just not sure if I should get conical or non-conical.