Unfortunately SuperSprint never got a 456 in for exhaust development! We have 550/575/599/612 headers for the V12s.
Then you do have one also for the 456, as the engine is the same as the 550 / 575 as is the basic architecture of the car.
In the July 2012 issue 600 CAR magazine from the UK there is a fabulous underside photo of the F12 without the underbody. Check out what seems to be a 3inch minimum sized exhaust system from the cats back. I would bet that the biggest portion of the extra 225bhp over a 575M has come from the free flowing exhaust. Most of the rest has come from a half litre more displacement and more than a 1000rpm extra. The smallest contributor will have been from new engine and engine management technology. I am of the opinion that Ferrari purposely choked back the output of the 575M to allow easy bhp improvements in the succeeding 599 and F12 models. They did this by squashing the too small exhaust in places or they were just idiots, which I somehow doubt was the case. As an aside, what happened in the F12 to the flow through buttresses which supposedly conferred an aerodynamic advantage in the 599? Those holes in the bonnet 'feeding' the Nike swoops will also fail to appear on the F12's successor. Surely if these are credible aero tweeks they would cumulate on each succeeding model? Just design features with a technical reason thought up afterwards to give credibility? Just my opinion.
QUOTE] Interesting thinking here. If one could spend $8,000 on the exhaust of a 575, and have 599 level horsepower, it would be a LOT less expensive than getting the 599 itself. I wonder if Ferrari would "deliberately" de-tune the 575, in favor of the later 599, and the subsequent F12 ? $8000 / 80 HP = $100 / HP. Not a bad deal. I would have to see a dyno sheet of before / after to be fully convinced though. Scott[/QUOTE] Scott, you get it mate. The 575 is the best Ferrari deal going, awesome classic front engined V12 and now easily upgraded to 599 performance. My hand held 60-100mph times (3.7sec best) have equalled or bettered the 599 times (3.9sec) quoted in EVO and creamed the stock 575 (5.4sec) also from EVO. I have purchased a Racelogic GPS performance computer like the car magazines use for their data, and should have some accurate times when I return home in September. This will be the "dyno" and is just as valid. Take off the weight saved from the 575's exhaust and it still weighs more than a 599. Logic says if the on road performance matches then the horsepower must be at least equal. That is over 100bhp and still without a re-map. That is the best hp improvement I have ever seen with just an exhaust, however if you look at what was there previously it does makes some sense.
These headers are a piece of art! I have a question though: the dyno shows engine power (Motorleistung) at 534.6 hp, wheel power (radleistung) at 411.5 hp and power loss (scheppleistung) at 123.1 hp or a high 23%. Is it normal on a 575M? I thought a commonly accepted figure was around 15% for a manual transmission and 20% for one with a torque converter?
