[War]

I’m looking to Install some BBK Long Tube headers on my 2017 Challenger RT 5.7. I just want to know what’s better suited for me. My Challenger is pretty stock except for a CAI and a Mid Muffler Delete. But I do plan on further modifying it.

1-3/4 in. LT
1-7/8 in LT
2 in LT

Which would better suit me? And give me more bang for my buck. Also any other header suggestions are welcome.

 

[ChallyTatum]

Most have been running 1-7/8, although in the earlier days 1-3/4 was the norm. I am running 2" but I am also running a supercharger.

 

[War]

Most have been running 1-7/8, although in the earlier days 1-3/4 was the norm. I am running 2" but I am also running a supercharger.

Does it throw CEL with the LT?

 

[ChallyTatum]

Does it throw CEL with the LT?

If you go catless...you bet. I have high flow cats and have not had any issues (running stock DTC and downstream O2 settings in the tune...except for transport delay which has been increased by 50%). I also run a set of O2 simulators from Big Daddies.

 

[Newoldchallenger]

Which is better suited now is not the question. The question is what are your plans for the future with the car?


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[richsimp55]

Does anyone know how much of the stock exhaust you can use installing long tubes?

 

[Newoldchallenger]

Does anyone know how much of the stock exhaust you can use installing long tubes?

Everything after the cat pipes if you pick the right system.


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[Curtisville Challenger's]

I have 1 3/4 on my 5.7 Challenger and I am pleased. Picked up at the drag strip. I put 1 7/8 on my ram 1500 and it killed the truck, couldn't wait to take them off which I did. 2 inch is way to big for what your doing now. I would go with 1 3/4 personally for what you are doing. My next motor I am building now I am debating 1 7/8 or 2in.

 

[JD40]

Go with the 1 7/8. Leaves room for plenty of other mods and it's not too much. 2" is more for the boosted cars or fully built strokers.

 

[kabookie10]

I'm running 2" long tubes from Stainless Works. I'm N/A and don't have much done. Only reason i'm doing that is because my car was used for R&D and i got them and a full cat back for free. If i had to buy a set, i'd go 1-3/4 or 1-7/8". I picked up decent HP with the 2" but you can defenitly tell that they are to big and the hp and torque curve shifted. In the future i may decide to go with a supercharger but from what i have heard the 2" headers are more for a fully built stroker that is supercharged. I'd like to downsize in the future possibly.

 

[misterg]

I have Kooks 1 7/8 and high flow cats. I am happy with the increase in power, and they sound great. You will of course need a tune to see any power gains.

 

[ChallyTatum]

I'm running 2" long tubes from Stainless Works. I'm N/A and don't have much done. Only reason i'm doing that is because my car was used for R&D and i got them and a full cat back for free. If i had to buy a set, i'd go 1-3/4 or 1-7/8". I picked up decent HP with the 2" but you can defenitly tell that they are to big and the hp and torque curve shifted. In the future i may decide to go with a supercharger but from what i have heard the 2" headers are more for a fully built stroker that is supercharged. I'd like to downsize in the future possibly.

I am running SW 2" headers on my SC 5.7L...haven't really noticed a loss in low end torque. I will say installing 2" is a PITA as it is really hard to get the bolts and my fat fingers around the pipes....which reminds me, I need to check the torque on those suckers.

 

[Juanglz90]

Misterg any problem installing the kooks header leaks or anything like that ? And do you think they would clear with a 2” drop without scraping the floor ?


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[misterg]

Misterg any problem installing the kooks header leaks or anything like that ? And do you think they would clear with a 2” drop without scraping the floor ?

I did not do the install myself, so I can't offer direct experience with it. But the shop that did the work said the Kooks headers are a little easier to work with because they have a rounded collector, so hooking up the rest of the exhaust is a little easier. Getting the headers in and attached to the engine is pretty much the same as any other long tubes. At stock ride height there are no issues with clearance. I can go straight over speed bumps, driveway entrances, etc. I don't need to crab over those. With a 2" drop I think they would clear but you would need to be careful. I can measure clearance at stock ride height, if you want, and see how it applies to a drop.

 

[ChallyTatum]

FWIW on a stock RT with no super track pack I have about 5" clearance.
https://www.challengertalk.com/forums/8448407-post10.html

 

[Juanglz90]

Misterg if you can measure that would be really appreciated thanks



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[misterg]

Misterg if you can measure that would be really appreciated thanks

Cats are the lowest part, for me. 4" clearance. Without cats you might get 1/2" more. This is stock suspension on a 2012 R/T.

 

[A Guy]

Cats being after you come off the wheel (like on a speed bump), more likely to be the "bottom out" point.

A Guy

 

[kabookie10]

I am running SW 2" headers on my SC 5.7L...haven't really noticed a loss in low end torque. I will say installing 2" is a PITA as it is really hard to get the bolts and my fat fingers around the pipes....which reminds me, I need to check the torque on those suckers.

I'm going to guess you notice that due to the supercharger. I'm N/A with only a tune. I gained torque and hp but i noticed that the curve shifted higher in the rpm band.

 

[ChallyTatum]

I'm going to guess you notice that due to the supercharger. I'm N/A with only a tune. I gained torque and hp but i noticed that the curve shifted higher in the rpm band.

Probably, did you do a dyno tune? Also what size pipe catback you running...stock or 3"?