Factory Fuel Rails question

I just ordered the budget return style fuel system from Lethal performance. Going E85 on my cobra. With the return fuel system (E85),2.9 upper pulley and tune from VMP I’m hoping for low to mid 700 hp range. Currently at 620 on 93 w/ a 3.1 upper.

My question is would it be alright to used the factory fuel rails or do I upgrade? The car is not daily driven or track driven. If money wasn’t the issue I would upgrade the fuel rails and have them put on when I have the fuel system done.


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Stock rails are fine. I made 700+ with them.


Kenne bell did a test back in the day abs there were no issues at 800+. Ill try to find the link.

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Thanks for the reply. Will go that route


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I'm running stock fuel rails as well. Not sure on hp.

2.3 tvs, Fore return, ARH headers, 21lbs, E85, tuned by 04sleeper.

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Bdubbs said:

I'm running stock fuel rails as well. Not sure on hp.

2.3 tvs, Fore return, ARH headers, 21lbs, E85, tuned by 04sleeper.

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Any ideas on hp? I few months ago I upgraded from the JLT rai, Accufab Tb and elbow to VMP’s gt500 elbow, tb, & intake. I’d like to get it dyno to see if this current set up gave me little more hp that the JLT. But I’m not gonna pay for dyno time since I’ll be going E85 in a month or two.


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KINGCarnge said:

Any ideas on hp? I few months ago I upgraded from the JLT rai, Accufab Tb and elbow to VMP’s gt500 elbow, tb, & intake. I’d like to get it dyno to see if this current set up gave me little more hp that the JLT. But I’m not gonna pay for dyno time since I’ll be going E85 in a month or two.


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I honestly have no idea. I'd guess around the 700 rwhp. Been running this combo on the corn for at least 4 years.

I also have jlt rai and gt500 tb.

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considering the lethal budget return system too. how much power can the budget return system handle (stock feed line, stock rails) and 60# injectors? if i went with aeromotive 340lph pumps or walbro 465's

I made over 700 on the factory rails. I was going to use them on when I upgraded to the gen4 2.9 crusher too but they didn't clear the blower so I was forced to upgrade.
If your on a budget, which im sure we all are to a point, stick with the stockers

714/680 on the stockers for 11years now.....E85 24/7/365.....so yes, the stockers work great

But if you are going to swap, remember Fore makes a set as well. Very pretty stuff.