Not to bring a old thread up. But I took the gamble and bought the kooks 1-5/8" for my boss. I plan on buildings custom FULL 3" exhaust to top it off. I'll be sure to post the dyno sheets and install pics for everyone.
Long tube headers, which Primary size is 'best'?
- Thread starter Shaun@AED
- Start date
Definitely interested in your results :beer:
Awesome. I was just reading through this thread and going to ask Shaun if he had seen Kooks or ARH 1-5/8" yet as I'm very curious if they would make a better torque curve. The 'Coyote Stock' setups come with 2.75" x pipe also, if you were a true guinnea pig you would use that too.... :banana: When do you plan to install?
Last edited:
I bought 1-7/8" SW headers because they are easy to sell. LOL. 1-3/4" and especially 1-5/8" headers are harder to get rid of.:lol1::rolling:
I actually talked to Vince at burns stainless today and he also seems to think that 1-3/4 and 1-7/8 are overkill. He said my combo would be very close to needing 1-3/4 but says it might JUST need it.
I think I'm gonna buy a new x pipe tonight so the install shouldn't be too far away. But I have no baseline and may not have it dyno'd right after the headers.
I think I'm gonna buy a new x pipe tonight so the install shouldn't be too far away. But I have no baseline and may not have it dyno'd right after the headers.
That's just not acceptable to us.... :nonono:
You need to go get a baseline and then dyno again right after the install... :rockon:
I want to, but I also have a lot of other parts I want to buy lol!
Just saw this post.
Shaun - I'm in the process of getting Kooks 1-7/8" headers as Drew over here recommended to go with those specifically for bigger up top power. He advised you'd lose a little down low (still gain some TQ, but, not as much) but gain more upper RPM power with the 1-7/8".
Based on my mods, AED Tune, Ported CJ, SCJ TB, Drew's 4.5" Intake W/Amsoil Dry GT500 Filter, Kooks O/R X or H Pipe (I currently have Lethal's H-Pipe and Stock Headers), Borla-S Axle Backs, should I go with 1-7/8"? Primarily, I don't see the track often, but, like to have fun off the track making quick pulls and such and I do want the sound of a Long Tube.
My car will be staying N/A and this is the last big-mod I do for at least a couple 2-3 years.
Once I get everything settled, I'll be bugging you again for a revision on the tune for the headers, haha. You're the man Shaun.
-Chris
Shaun - I'm in the process of getting Kooks 1-7/8" headers as Drew over here recommended to go with those specifically for bigger up top power. He advised you'd lose a little down low (still gain some TQ, but, not as much) but gain more upper RPM power with the 1-7/8".
Based on my mods, AED Tune, Ported CJ, SCJ TB, Drew's 4.5" Intake W/Amsoil Dry GT500 Filter, Kooks O/R X or H Pipe (I currently have Lethal's H-Pipe and Stock Headers), Borla-S Axle Backs, should I go with 1-7/8"? Primarily, I don't see the track often, but, like to have fun off the track making quick pulls and such and I do want the sound of a Long Tube.
My car will be staying N/A and this is the last big-mod I do for at least a couple 2-3 years.
Once I get everything settled, I'll be bugging you again for a revision on the tune for the headers, haha. You're the man Shaun.
-Chris
Last edited:
This is a great thread, Shaun. So, it sounds like the efficiency of the ENTIRE exhaust system matters, even for the street. I like the Kooks mid-length as well. The real question for me is whether or not my VMP TVS Coyote with 82mm pulley on 91 will benefit and to what general degree with a true 3" exhaust all the way back. Shaun or anyone else care to speculate?
Also, does anybody make a true 3" axle-back? Thanks...
Also, does anybody make a true 3" axle-back? Thanks...
Ordered a set of Kooks 1&3/4 mid-lengths today at Shaun's recommendation; bump for good reading on anyone still milling this 'debate' over.
Last edited:
Get us some numbers if you can. I'm going to try and get before and after. I got speed master stepped 1-7/8" headers and pypes off road x.
Last edited:
Sure thing. I have to get an updated classing dyno after I get them installed anyhow.
Car already has a Lethal O/R X and AED tune so the delta may not be as significant as those going from bone stock to headers+tune.
Car already has a Lethal O/R X and AED tune so the delta may not be as significant as those going from bone stock to headers+tune.
Got ya. I'm going from cai/tune to off road X, long tubes and new tune. Hoping 25+ rwhp gains.
Guys if any can share his dyno runs and we can compare maybe we can find some difference and then well definitely know the diference by real senario testing..
This topic hasnt be done yet lol... interested to c more feedback
This topic hasnt be done yet lol... interested to c more feedback
So I'm curious, If 1 7/8 is supposedly to big for those that aren't going FI
Then what would Anyone say about MBRP 1.875 Headers for those that aren't going FI? Is it to Big?
Then what would Anyone say about MBRP 1.875 Headers for those that aren't going FI? Is it to Big?
plug 7 divide by 8 into a calculator, 1 1/8 is the same as 1.875.
Any updates on this topic? Looking to buy headers-to-tip exhaust when returning to the States from this mission.
buy 1 7//8 and call it a day.....
or do the stepped and get the best of both world
or do the stepped and get the best of both world
Users who are viewing this thread
