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Discussion Starter · #1 ·
I have a true dual system using a Magnaflow x-pipe connected to 2 straight flow FlowTech glasspacks with 2.25 inch "crushed bend" pipes. Unfortunately, there are no Dyno stations in my neighborhood. I have a couple of questions for all you "techno guys". In a 'ballpark' figure, how much HP/torque have I gained in this system? Second question: I have plans to upgrade my system to 2.5 inch pipe diameter using "mandrel bend" 304 stainless steel pipes and 2 "Ractive" straight flow mufflers connected by an x-pipe. With this upgrade to larger bore pipes, how significant is the increase in HP? Gentlemen, I appreciate your input.
Photos of my current exhaust at my web-link below my sig. Thanks.
 

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It would be very very hard to guess about something like this. I had a custom exhaust installed also and wound up losing a little bottom end torque. I have the 2 3/4 inch pipes and dual in/out Flowmaster 50 series muffler. No X or H pipe. I have thought about adding an X pipe to see if that helped any but haven't gotten to it. You will get better flow for sure with Mandrel bent pipes as opposed to the crushed bent because the crushed bent cuts off air flow from being more narrow. The reason I lost some torque was because I don't have as much back pressure as before and these engines need a certain amount to get the power on the bottom end. Hopefully JetTech will jump in here with more info. I am by no means a exhaust specialist. One thing I go by is the feel. Does it feel more powerfull now? I have yet to go to a dyno but I dont need to because I know I lost low end. I did pick up a little on the top though which is ok.
jump in JT
M4ck
 
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If your going to upgrade your pipes, is there a reason you are staying with 2 1/2? I would think you would get much better performance out of going 2 3/4 or even 3".

I believe m4cks backpreasure loss is more from his muffler selection, rather then pipe size.
 

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gr8TITAN said:
I have a true dual system using a Magnaflow x-pipe connected to 2 straight flow FlowTech glasspacks with 2.25 inch "crushed bend" pipes. Unfortunately, there are no Dyno stations in my neighborhood. I have a couple of questions for all you "techno guys". In a 'ballpark' figure, how much HP/torque have I gained in this system? Second question: I have plans to upgrade my system to 2.5 inch pipe diameter using "mandrel bend" 304 stainless steel pipes and 2 "Ractive" straight flow mufflers connected by an x-pipe. With this upgrade to larger bore pipes, how significant is the increase in HP? Gentlemen, I appreciate your input.
Photos of my current exhaust at my web-link below my sig. Thanks.
To answer your first question....well there really is no firm answer. After looking at the pics of your setup it doesn't appear you have much restriction at all. It could be "ballparked" in the neighborhood of maybe 10hp and 15tq gained.

The Ractive mufflers look really nice from your pics and should quiet things down a bit from where it is right now. Also going to a mandrel bent system is a good move.

I really don't think I answered your question very well but without a dyno or some way of testing the 2 different setups, your actual gains will remain a mystery. If the system your running now is meeting your "seat of the pants" approval then why change it??? Is it too loud or are you trying to get more hp? You'll need to make a fairly substantial gain to actually feel it so I'm guessing right now you might be disappointed with your new system. It sure looks good though. Please let us know how it all works out and sounds.
 

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Discussion Starter · #5 ·
BiXLL said:
If your going to upgrade your pipes, is there a reason you are staying with 2 1/2? I would think you would get much better performance out of going 2 3/4 or even 3".

I believe m4cks backpreasure loss is more from his muffler selection, rather then pipe size.
BiXLL, JetTech & m4ck,
Thank you all for the responses. Very encouraging!! From previous research made, BiXLL is correct that certain back pressure is needed, however, gas engines producing up to 350 HPs can maintain the needed back pressure with either a single pipe 3-4 inches or double pipe 2.5 inches max .. reason why I wanted to stay at maximum 2.5 inches - double pipe www.bobsmuffler.com/sugpipe.htm My biggest mistake was not having my ride dyno'ed prior to all these mods so I do not even know my 'baseline numbers'. JetTech, another reason for the change is the drone that was 'music' to my ears at first is now turning into intolerable 'noise'. It sounds very intimidating & aggressive at any parking lot but turns into nuisance when I'm cruising by myself and no one to intimidate. I swear by the seat of my pants dyno that I've gained low end torque and my RPMs climb up quicker than stock (but it just be my as* talking. LOL) compared to my friend's identical Titan. (check my site for link to a 'pair of Titans') I'll try to post some photos when I have the "Ractive system" installed and hope that I don't waste some hard earned dollars.
Gentlemen, my thanks to you all
 
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It sounds like you have done your homework, and know the direction you want to go. I do have a question for you regarding your issue with drone. What type of tips are you using, and are they coming out far enough from bottom of truck? I ask this, as a lot of people have gotten rid of the majority of their drone using the Banks system by eliminating the megaphone, and oversized tips. Could this possibly help you?
 

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Discussion Starter · #7 ·
The pipes are 2.25 all the way to the end. The chrome tips you see in the photos are just salad dressing. I thought of using resonator tips like the "Monza type" but I was hooked on the bigger is better approach (which I should have done in the first place duh?) and bought the new system parts in the inappropriate time. I'll continue to search a dyno shop around town and hopefully, I can have some comparative numbers for the two set-ups to share. I'll update this forum and my website as I continue with this exhaust modification.
PEACE
 
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