Exhaust operation and the back pressure myth "Or" Ask Uncle Otto about exhaust
04-14-2013, 08:23 PM
#131
Got the exhaust done. SI/DO Magnaflow 14" body. Exits out before the tire 2.25 pipe with 3" tips. Sounds good, mild, low sound until WOT, then its pretty dang loud! Dont feel any sluggishness off the line, mid-high rpms feels stronger. That is all.
04-14-2013, 08:43 PM
#132
Senior Member
Join Date: Jul 2008
Location: Long Beach Calimexifornia
Posts: 58,557
Received 1,162 Likes
on
647 Posts
hey what about inline engines? i'm running a 4.9l 300 and was thinking of going longtube headers to true duals 2.5 inch each through 2 seperate flowmaster super 40 series mufflers 2.5in/out then dumping exhaust out the side before the rear passenger side wheel.. am i losing too much velocity? should I be addding in a crossover pipe? Thanks!
Last edited by ymeski56; 04-14-2013 at 08:45 PM.
04-15-2013, 03:30 PM
#133
Member
Join Date: Apr 2013
Posts: 41
Likes: 0
Received 0 Likes
on
0 Posts
Well if I installed a crossover pipe it would help some, would it not? Only problem I can see is the fact that the two collectors aren't in the same spot. One collector is about a foot behind the other (due to the cylinders being inline) so would the fact that the tubes aren't sycronized (because of the space between the two collectors) defeat the proper scavenging use of the crossover pipe? Also if the longtube headers are going to take away the low end torque, aren't there other upgrades that could make up for that? (Assuming the lowend torque is just going to move up the power band to mid-highend torque) thanks again for helping a newbie!
04-16-2013, 12:10 PM
#134
First of all... awesome thread!! Wish I had found this a few days earlier.. I have an appointment tomorrow morning at my local shop for and exhaust install. Now I'm starting to second guess my original plans.
I have a 2010 5.4 with Edge tuner. I'm not really looking for much of a hp gain, mainly just the sound... that being said, I dont really want to loose any of my low end torque. My original plan was to replace the factory muffler and install a SI/DO 2.5" outlet magnaflow, and do a "Roush Offroad style" side exit before the rear tires.
Do you guys think this would cause my power band to move up in rpms or cause me to have issues with low end torque loss? I could always do a Borla round muffler with stock tail pipe and tip.. just doesnt look as cool, and not sure if it would have the sound i'm looking for. Not really looking for LOUD.. but stock is just to quiet.
What do you guys think? Thanks again for the thread.. awesome read!! And Thanks for your input.
I have a 2010 5.4 with Edge tuner. I'm not really looking for much of a hp gain, mainly just the sound... that being said, I dont really want to loose any of my low end torque. My original plan was to replace the factory muffler and install a SI/DO 2.5" outlet magnaflow, and do a "Roush Offroad style" side exit before the rear tires.
Do you guys think this would cause my power band to move up in rpms or cause me to have issues with low end torque loss? I could always do a Borla round muffler with stock tail pipe and tip.. just doesnt look as cool, and not sure if it would have the sound i'm looking for. Not really looking for LOUD.. but stock is just to quiet.
What do you guys think? Thanks again for the thread.. awesome read!! And Thanks for your input.
Shorty equal length headers are the best for sustaining your low end torque and increasing flow. They are a tight fit. I have the EOM JBA shorty's on my 5.4 2003 with glass packs behind them. My truck is as loud if not louder than a stock manifold with flowmasters. The glass packs quiet down the headers. A flowmaster is louder than Dynomax but in my experience on the race track is the Dynomax will create more back preasure than flowmaster. I ran both exhaust systems on my 5.0 Mustang. I switched to flowmaster when I went to a taller came and larger valves.
In my opinion and remember it's just my opinion, the best setup on a stock 5.4 2 valve would be a shorty headers or equal length with Dynomax behind them. The Dynomax seems to hold the low end torque numbers better than flowmaster or at least it did on my 5.0. My 60 foot times went down on flowmasters, but my 1/4 mile speed went up.
My 2003 F150 with the shorty's and CAI system stays just about door to door with a friend of mines 2005 3 valve 5.4. He gets me by about a half a truck on the ole, (Smash your foot to the rug race)
He just has headers on a stock 5.4, but his truck is a standard cab short bed step side. Mine is a super cab. Both of them are FX4's.
So head to head we should be even matched if I got rid of the extra weight of the supercab and my truck is a 2 valve 260 horse and his is a 3 valve 300 horse.
So somehow those JBA's plus CAI are just about making up that 40 horse difference.
04-18-2013, 04:32 PM
#136
Your right, I was watching two fellas ask about mufflers and one was asking about just adding flowmasters.
I think I grabbed yours by accident.
Oh well, maybe the information will help. I like all the techy information and how it relates to real world testing.
Truth is, it's just tech talk until you bolt it on and try it or read another guys experience with that setup. I don't go to the track anymore but I will grab a friend with a similar setup and run um.
You don't know how the horse will run until you run it.
I think I grabbed yours by accident.
Oh well, maybe the information will help. I like all the techy information and how it relates to real world testing.
Truth is, it's just tech talk until you bolt it on and try it or read another guys experience with that setup. I don't go to the track anymore but I will grab a friend with a similar setup and run um.
You don't know how the horse will run until you run it.
04-27-2013, 04:49 PM
#137
Junior Member
Join Date: Apr 2013
Posts: 2
Likes: 0
Received 0 Likes
on
0 Posts
Ok I have an 07 king ranch 4x4 supercrew with 130,000 miles. It has the afe stage 2 cold air intake and the edge evolution cs programmer with a SI/DO magnaflow exhaust. It really came alive with these upgrades. But I want a true dual so whats the best setup? Just run 2 separate pipes, x,h some type of crossover??? Any input would be great.
07-16-2013, 07:34 AM
#138
you said 3 feet after the merger?? is that the cross over you were talking about. cause on my truck i have a flowmaster outlaw and my exhaust exits in font of my tire. so my system is pretty open..
07-18-2013, 09:23 PM
#139
Senior Member
Thread Starter
Three feet is a general rule and that is after the cross/merger. Even in front of the tire you have a couple feet worth. In normal driving, that probably won't affect the powerband enough for the butt dyno to determine. For the early 97's they came stock with the exhaust exiting in front of the tire.
08-06-2013, 04:48 PM
#140
I had a muffler installed today. I asked for them to weld in a Magnaflow and tip, and leave stock tubing. This is on my 2012 5.0. I watched part of the installation. The muffler looked like a magnaflow, had an offset, but had a nice straight though design. I could clearly see through, had a nice smooth bend since it was offset. Sounds nice too.
When I got home I was checking it out, and realized it is not a Magnaflow. I called the shop and they said it is a stainless steel muffler, but it is a max flow, not magnaflow.
Will this max flow hurt performance? Should I go through the trouble of making them swamp the muffler out?
When I got home I was checking it out, and realized it is not a Magnaflow. I called the shop and they said it is a stainless steel muffler, but it is a max flow, not magnaflow.
Will this max flow hurt performance? Should I go through the trouble of making them swamp the muffler out?