read the 300D site. They are more different than a like.
Here is snippet of the features.
Advantages to our design:
Bolt on application. Absolutely no machining, welding, or fabrication required. For pintle-less injectors with the early plenum, there is a small amount of grinding to make the #1 injector fit. (Better than Stock and the Border aftermarket fuel rail depending on injector choice)
Can be plumbed in serial or parallel. Installation flexibility is user definable for performance applications. The installation of a parallel feed system should aid in preventing fuel starvation in cylinders 5 and 6 as is common with a stock setup. (Better than Stock) Has 57% "faster" pressure recovery then a stock fuel rail. The 300 Degree rails maintain pressure longer then a stock fuel rail while regaining fuel pressure quicker with out hindering fuel flow below the delivery rate of the stock fuel pump. (Better than Stock) Increased fuel velocity when pressure begins to drop which assists in the recovery of fuel pressure. This will be beneficial for those that run Nitorus Oxide Injection systems where the fuel pressure drops to undesirable levels during NOS injection. (Better than Stock and Border) They are completely thermally isolated from the upper and lower plenums. The stock fuel rails are thermally isolated, the border fuel rails are not. This can lead to heat soaking of the fuel rail, increasing fuel temperature. (Better than Border) Fuel injector to main bore alignment is optimized for maximum fuel delivery. (Better than Stock and Border) Absolutely the highest and tightest tolerance for all threads where the AN fittings attach. This, coupled with an interference fit and o-rings, provides the greatest defense against fluid leaks between the rail and the plumbing. Completely designed in CAD software 2D and 3D.
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"Carrying a gun is like having a second cock. If your other cock could kill someone. " - Movie Superbad. "You are all about to get f*cked by the long d*ck of the law" - Superbad "It's better to be dead and cool than alive and uncool"
Don Johnson in -Harley Davidson and the Marlboro Man "Yes, I know more then JWT. Someone has to be the top dog, and it just so happens it's me." Nixit
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