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Performance Exhaust SystemsDetailed discussions regarding performance headers, single, dual, street and off-hard racing exhaust systems for your vehicle.
This is a discussion thread titled "Tundra Exhaust", within the Performance Exhaust Systems forum, part of the Technical & Vehicle Assistance Forums category.
Yesterday I had my JBA Dual Side Outlet Exhaust system installed. Over all I am very pleased. $419.00 for the kit (all SS mandrel bent), $107.00 for all welded install. This is a pretty impressive system for the $$$. I like the sound. Reminds me of an older rolling cherry bomb sound but more subdued. If there's anyone out there with the same set up, gimme some feedback! Monday morning I install my Volant CAI system. Then I'll be done moving the air through... Unless some one has another idea!!!
__________________ 07 SR5 TRD DC 5.7 Slate Metallic Pro-Coat Spray in Liner Toyota Bed/ Deck rail System Draw-Tite Intella-Stop brake controller JBA Cat-back Dual In/ Dual Side Exits
TRD Sport Shifter ScangaugeII
Extang Trifecta TRD CAI
I actually just removed that JBA Dual Exhaust from my Tundra after having it installed a couple months ago. I put the stock exhaust back on temporarily and got back the low end power and throttle response i had lost. Knowing now what I have learned over the past couple months about exhausts, I would recommend the JBA single exit over the dual for overall best performance.
Thanks for the feedback. So far I have not noticed any losses but then it's only been a couple of days. I almost went with the single. I fell in love with the JBA's old school kind of sound (reminded me of my 67 Mustang with cherry bombs). I'm sure that this is not the best way to decide on an exhaust system but I was bitten. I did keep the stock system just in case. Please tell me more about " what you have learned over the past months", if I do decide to make a change, I could use all the knowledge available. Have you installed a CAI system to compliment the exhaust?
Quote:
Originally Posted by blackbeauty
I actually just removed that JBA Dual Exhaust from my Tundra after having it installed a couple months ago. I put the stock exhaust back on temporarily and got back the low end power and throttle response i had lost. Knowing now what I have learned over the past couple months about exhausts, I would recommend the JBA single exit over the dual for overall best performance.
__________________ 07 SR5 TRD DC 5.7 Slate Metallic Pro-Coat Spray in Liner Toyota Bed/ Deck rail System Draw-Tite Intella-Stop brake controller JBA Cat-back Dual In/ Dual Side Exits
TRD Sport Shifter ScangaugeII
Extang Trifecta TRD CAI
Yep... looks like the same system. Since I have only had them a couple of days, and I do not utilize any sophisticated mechanical measurement devices, I can only tell you how it feels to my ears, eyes and touch. Keep in mind that this is based on very limited usage. As for Horsepower and torque... I really don't feel any significant shift either way, but read Blackbeauty's response. I have only tested for Drone at the two speeds someone previously posted in comments, 35 and 55 MPH. So far... no drone up to 55. Haven't checked beyond that. As for the sound... I am no expert on the terminologies of automotive exhaust sounds... and it is such a personal thing to me. Personally I love it. You may not. After a brief break in period I will upload some sound bytes. for you reply.
Quote:
Originally Posted by tigerking
I have seen these JBA exhausts on ebay for about that price, that is if these are the same model.
Thanks for the feedback. So far I have not noticed any losses but then it's only been a couple of days. I almost went with the single. I fell in love with the JBA's old school kind of sound (reminded me of my 67 Mustang with cherry bombs). I'm sure that this is not the best way to decide on an exhaust system but I was bitten. I did keep the stock system just in case. Please tell me more about " what you have learned over the past months", if I do decide to make a change, I could use all the knowledge available. Have you installed a CAI system to compliment the exhaust?
The JBA seems like a pretty well built cat-back. The problem on the dual version is there decision to use 2.5" piping all the way back. The most important thing I've learned is that when you use exhaust piping that is too large, especially on the pipe or pipes that run back to the front of the muffler, it actually causes the exhaust gases to slow down in speed before reaching the muffler and that causes a loss of power/torque in the lower RPM range which is where we spend most of of time when driving around normally.
What I was thinking about doing with the JBA was either replacing the 2 front pipes with smaller diameter pipes, either 2 1/4" or having the front pipes on the stock exhaust cut-off and installed in front of the JBA since you can't find 2 1/8" pipe, to my knowledge, in the aftermarket.
The other option, and cheaper as well, that I came up with was having a cross pipe or H-pipe installed in between the 2 front pipes right after the bends on the way back to the muffler. I've read that his can help restore any loss of low end power and possibly help with any drone as well. I noticed that flowmaster has done this with their dual cat-back system for the Tundra.
I ended up removing the JBA instead of modifying it and am in the process of going another route so I can't really say with any certainty just how well the H-pipe would have worked but I know that the smaller piping would have helped.
If you look at the JBA single exhaust, you will notice that they use a Y-pipe in front of the muffler which is 2- 2 1/4" pipes into 1-3" collector pipe going into the muffler, ( the Zoomers is similar in design as well), and this causes a scavenging effect with the exhaust gases which helps keep or maybe even increase low-end power. I think JBA should have used this Y-pipe on their dual exhaust as well instead of the 2 seperate pipes and went with a single in dual out muffler or stuck with 2 1/4" piping like Borla did.
I noticed that JBA doesn't even offer a dual system for the Dodge Ram or Nissan Titan. They do offer one for the Chevy trucks I think. They don't offer any exhaust at all for the Ford F-150 for some reason. I only bring this up because, I spent some time on the titantalk forum and the JBA exhaust is thought of highly over there, but again it is a single exit system that uses a 2" Y-pipe running into the muffler.
If you have any plans to install headers then I would'nt worry about anything since that would fix any problems. I actually think JBA designed their exhaust to be used with their headers.
Last edited by blackbeauty; 11-26-2007 at 12:37 AM.
Today I talked to a local shop about this. They gave me an excellent price on replacing the JBA 2.5" inlet pipes with my stock 2.125" pipes. They have installed systems on many of my vehicles so I trust their work. I'll let you know how it turns out. I am concerned about 2 things... 1st, I love my current sound... 2nd, I have yet to detect any drone in the current config.... Man, decisions decisions... But that's the Fun of it I guess.
__________________ 07 SR5 TRD DC 5.7 Slate Metallic Pro-Coat Spray in Liner Toyota Bed/ Deck rail System Draw-Tite Intella-Stop brake controller JBA Cat-back Dual In/ Dual Side Exits
TRD Sport Shifter ScangaugeII
Extang Trifecta TRD CAI
might wanna do a search on "your" H-pipe theory,it has been THROUGHLY discussed already.FlowMaster got their idea from the TS forum.Guess who originally solved the issue ?
Quote:
Originally Posted by blackbeauty
The JBA seems like a pretty well built cat-back. The problem on the dual version is there decision to use 2.5" piping all the way back. The most important thing I've learned is that when you use exhaust piping that is too large, especially on the pipe or pipes that run back to the front of the muffler, it actually causes the exhaust gases to slow down in speed before reaching the muffler and that causes a loss of power/torque in the lower RPM range which is where we spend most of of time when driving around normally.
What I was thinking about doing with the JBA was either replacing the 2 front pipes with smaller diameter pipes, either 2 1/4" or having the front pipes on the stock exhaust cut-off and installed in front of the JBA since you can't find 2 1/8" pipe, to my knowledge, in the aftermarket.
*************************************
The other option, and cheaper as well, that I came up with was having a cross pipe or H-pipe installed in between the 2 front pipes right after the bends on the way back to the muffler. I've read that his can help restore any loss of low end power and possibly help with any drone as well. I noticed that flowmaster has done this with their dual cat-back system for the Tundra.
I ended up removing the JBA instead of modifying it and am in the process of going another route so I can't really say with any certainty just how well the H-pipe would have worked but I know that the smaller piping would have helped.
If you look at the JBA single exhaust, you will notice that they use a Y-pipe in front of the muffler which is 2- 2 1/4" pipes into 1-3" collector pipe going into the muffler, ( the Zoomers is similar in design as well), and this causes a scavenging effect with the exhaust gases which helps keep or maybe even increase low-end power. I think JBA should have used this Y-pipe on their dual exhaust as well instead of the 2 seperate pipes and went with a single in dual out muffler or stuck with 2 1/4" piping like Borla did.
I noticed that JBA doesn't even offer a dual system for the Dodge Ram or Nissan Titan. They do offer one for the Chevy trucks I think. They don't offer any exhaust at all for the Ford F-150 for some reason. I only bring this up because, I spent some time on the titantalk forum and the JBA exhaust is thought of highly over there, but again it is a single exit system that uses a 2" Y-pipe running into the muffler.
If you have any plans to install headers then I would'nt worry about anything since that would fix any problems. I actually think JBA designed their exhaust to be used with their headers.
might wanna do a search on "your" H-pipe theory,it has been THROUGHLY discussed already.FlowMaster got their idea from the TS forum.Guess who originally solved the issue ?
Is that right? Well where the he** did they come up with the idea to use dual 3" pipes all the way through?
Like I mentioned, Flowmaster recently released a dual cat-back system for the Tundra and it has an H-pipe incorporated into the 2 front pipes like I described above.
The H-pipe isn't MY theory. I did spend literally hours searching different forums for exhaust info and read a lot of posts that talked about low end loss and drone etc. That is where I found out about it. It's a popular thing with Mustang exhausts. As far as Flowmaster getting the idea to use the H-pipe in their system by reading this forum, I find that highly unlikely.
Like I mentioned, Flowmaster recently released a dual cat-back system for the Tundra and it has an H-pipe incorporated into the 2 front pipes like I described above.
The H-pipe isn't MY theory. I did spend literally hours searching different forums for exhaust info and read a lot of posts that talked about low end loss and drone etc. That is where I found out about it. It's a popular thing with Mustang exhausts. As far as Flowmaster getting the idea to use the H-pipe in their system by reading this forum, I find that highly unlikely.
__________________ 07 SR5 TRD DC 5.7 Slate Metallic Pro-Coat Spray in Liner Toyota Bed/ Deck rail System Draw-Tite Intella-Stop brake controller JBA Cat-back Dual In/ Dual Side Exits
TRD Sport Shifter ScangaugeII
Extang Trifecta TRD CAI
Tundra Exhaust
Re: Tundra Exhaust
TigerKing
Thanks for the feedback. So far I have not noticed any losses but then it's only been a couple of days. I almost went with the single. I fell in love with the JBA's old school kind of sound (reminded me of my 67 Mustang with cherry bombs). I'm sure that this is not the best way to decide on an exhaust system but I was bitten. I did keep the stock system just in case. Please tell me more about " what you have learned over the past months", if I do decide to make a change, I could use all the knowledge available. Have you installed a CAI system to compliment the exhaust? 
. You may not. After a brief break in period I will upload some sound bytes. 
