Fair enough but fwiw I've made 1100+rwhp on several occasions with efi and a 3/8 feed line.

I wouldn't bother trying to fit a 5/8 feed with EFI unless I was aiming for 3000+hp.

Understood if you don't want to change it but just thought I would mention that it's way overkill.

I use .035 wall tube. I used to buy 16 foot lengths, but now I can only buy 6' lengths. The really soft aluminum coils you can get at Summit work fine too, but straightening it can be difficult.

I set the braided system up on advise from Aeromotive years ago. Its a 10 feed and 8 return, would this equate to 5/8 and 1/2 hardline? Magnafuel recommends the same -10 feed and-8 return for my combo in ss braided. Are size requirements less for hardline??

Just to make sure were on the same page the 1/2 and 5/8 are OD sizes.

You are correct on the size correlation, (-10 being 5/8 and -8 being 1/2).

The size requirements are not less for hard line.

Not sure why both of those companies recommended that size, would only make sense to me if it was a low pressure carbureted system. (what would they recommend for that, -20?)

The cars with the 3/8 feed line were 4th generation f-body's with the stock fuel feed line (3/8 OD) at 1100+rwhp, so even if you went -8 feed it would be overkill.

Again, do whatever you feel comfortable with, just sharing my experience that you can easily meet your goals with much less feed line.

Thanks for the input, i have always wondered if i could choke the lines down. Lets hear a little more on the combo, ie cubes, power adder, fuel pump, injectors etc...Big wheel HP makes them sound cool already!

A few were 402-408ci LS motors with twin 67mm turbos, 1150rwhp.

One was 370ci and ran 8.30's at 165mph in the 1/4.

Most were twin walbros with a boost a pump and 96-120lb/hr injectors and stock 3/8 feed line.

We do have one car with a -10 feed line that runs 205mph in the 1/4. At 3215lbs that's around 2000hp.

(I work for a shop that specializes in turbo LS setups)