Originally Posted by Irace86.2.0 (Post 3277411)

Let's also examine the evolution of the EL JDL headers:

Originally Posted by Irace86.2.0 (Post 3277403)

Maybe I am confused, but it looks like the Ace 4-2 header and 2-1 overpipe is $1700, and the JDL 4-2-1 header and "1-1" overripe is $1500. The JDL 4-2-1 header is $1200. It seems like $200 is worth the difference.

I think it is worth it to describe these headers better. The Ace is not a 4-2-1 header. As I said above, it is a 4-2 header, which works with their 2-1 overpipes, and that overpipe varies, such that the 150/250/350 progressively adds more length to the two pipes before they merge.

https://dqzrr9k4bjpzk.cloudfront.net...1031667476.jpg

The JDL header is maximizing the runner length as much as it can for the limits of a 4-2-1 header by merging to a single exit at the last possible inch. (Estimated from the pictures) The JDL header merges about 4-6 inches sooner than the Ace 150, which merges about 4-6 inches sooner than the 250, which merges about 4-6 inches sooner than the 350. Also, the Ace header has 4 pipes for three-quarters or more of its length, where the JDL has 4 pipes for about one-half its length.

https://counterspacegarage.r.worldss...dl-421el-2.jpg

https://dqzrr9k4bjpzk.cloudfront.net...1031667406.jpg
https://dqzrr9k4bjpzk.cloudfront.net...1031667411.jpg
https://dqzrr9k4bjpzk.cloudfront.net...1031667416.jpg

My guess is that we could plot the differences on a dyno between the 150/250/350 and extrapolate that the JDL would be equivalent to a 50 in the lineup, such that JDL50/Ace150/Ace250/Ace350 would follow like so. With that said, if your setup was ideal for the 150 over say the 350 then the JDL setup could also be ideal, but if the 350 was already better than the 150 than the 350 will be even that much more better than the JDL.

Originally Posted by jflogerzi (Post 3278057)

I don't see any results just pictures. You mind sharing?

Sent from my GM1915 using Tapatalk

Originally Posted by Irace86.2.0 (Post 3277411)

Let's also examine the evolution of the EL JDL headers:

4-1 EL Header

https://86speed.com/images/thumbs/w_...gth-header.png

4-2-1 EL Header (old)...there is an equal length to each stage of the runners.

https://www.ft86club.com/forums/atta...1&d=1538525147

4-2-1 EL Header (new)...there are longer runners with a merging of the pipes to a single pipe at the very end.

https://counterspacegarage.r.worldss...dl-421el-2.jpg

Originally Posted by JBezugs (Post 3278266)

There is only 1 version of the 4-2-1 EL Header. Although it is not apparent in the photo, that cerakoted header has its merge right at the exit to the overpipe, just as the uncoated header below that (that was the prototype).

My 4-2-1 header: https://uploads.tapatalk-cdn.com/201...7526888656.jpg

Originally Posted by Irace86.2.0 (Post 3278274)

So you are saying JDL never produced this header from the picture I refer to as the old 4-2-1 header? You are saying it was just a prototype that was never released? If this isn't what you meant than I am confused as to what you are trying to say. Or are you saying the picture is an optical illusion because the other merger pipe is visually superimposed on the other, so it can't be seen?

https://www.ft86club.com/forums/atta...1&d=1538525147

Originally Posted by JBezugs (Post 3278288)

The photo of the old (cerakoted) header is an optical illusion; Because of the way the merge collector by the overripe flange is positioned relative to the angle of the photo, you can't actually see the final merge. Looking underneath the header from a different angle, you can see it.

Originally Posted by jflogerzi (Post 3278756)

Well I have one on order and will try and get in on the Dyno.

Originally Posted by JBezugs (Post 3278786)

Look forward to results! Are you picking up an overpipe as well? I have the stock OP on my JDL 4-2-1 setup currently, but I'm wondering whether or not I should pick up an aftermarket unit in the spring.

I've heard from many that I've made a "huge" mistake by keeping the stock OP paired with my header and that I'm losing precious ponies... I'm still going to keep my stock FP in place however.