Quote:
Originally Posted by MilkyWitness
Finally some data I've been waiting for. It's good to see the JDL 4-2-1 against the ACE and a stock tune. I have a set of the JDL 4-2-1's with a black coating sitting behind me in my room waiting for me to put them on. They still seem to be pretty awesome and its great to see that it destroys the torque dip! Just sucks that the gains aren't as good as I hoped for. Makes me wonder if I shoulda busted the extra $500 for the ace headers. :s honestly seems similar to a cheap UEL set up...but like almost twice the price for the jdl's. RIP
|
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.
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.
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.