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  #21  
Old Sun, October 25th, 2009, 11:02 PM
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Originally Posted by 99350 View Post
Sorry to chime in late here but I have a couple of tidbits you might want to take into account for your exhaust purchase.

1) the scavaging of the exhaust happens in the manifolds/headers and then the rest of the exhaust helps keep that flow going.

2) if you go with true duals an H-pipe or X-pipe in the middle will help equalize the pressures b/t the 2 sides and help with the scavaging effect (due to the firing order)

3) Your pipe diameter is also important if it is too big then there is not enough backpressure and you will actually loose power and for single exhaust you want the pipe diameter about 1.5-1.75X the size of duals (most aftermarket exhaust companies already done the calculations to find the right diameter for you application)

I would look for a quieter system by law they are required to meet a maximum 95db level to be street legal otherwise it will be for offroad use only. I like the sound of flowmasters quite series mufflers when at WOT or part throttle you can hear it pretty good outside the truck it sounds good plus at cruise speeds it sounds almost stock no annoying drone or excess noise.

My $.02
Some very good points.
The other thing I like to add is the flowmaster is not a straight through design which can change things also.
Also a straight through cat back 3" si/so muffler is the max best you can do to the vehicle before changing cats headers and the "y". All those need custom tune support.

Lars
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  #22  
Old Mon, October 26th, 2009, 09:06 PM
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Yes and no to the needing custom tunes for the extra exhaust you do not have to have it but you will be able to take full advantage with a tune.

All newer and older carbed vehicles are like this some manufacturers will see the extra power and detune to make the factory power after adding bolt-ons (Subaru is the worse)

Oh some food for thought if anyone is looking at making some big power #'s later on testing different collector lengths primary lengths etc can help get the last little bit f power out of the motor. (NASCAR guys are playing with them)
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Old Mon, October 26th, 2009, 10:24 PM
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Originally Posted by 99350 View Post
Yes and no to the needing custom tunes for the extra exhaust you do not have to have it but you will be able to take full advantage with a tune.

All newer and older carbed vehicles are like this some manufacturers will see the extra power and detune to make the factory power after adding bolt-ons (Subaru is the worse)

Oh some food for thought if anyone is looking at making some big power #'s later on testing different collector lengths primary lengths etc can help get the last little bit f power out of the motor. (NASCAR guys are playing with them)
That's probably why the easily exchanged shorty header, a simple exchange for the stock header, doesn't see any gains.
But the long tube header that needs some cutting and fabbing to get in requires the additional need for a custom tune. This is probably due to the increased collector length. Like you posted.
Then you throw in some high flow cats and your motor is really pushing the air out.

Lars
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Old Tue, October 27th, 2009, 12:00 PM
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Originally Posted by 88Racing View Post
That's probably why the easily exchanged shorty header, a simple exchange for the stock header, doesn't see any gains.
But the long tube header that needs some cutting and fabbing to get in requires the additional need for a custom tune. This is probably due to the increased collector length. Like you posted.
Then you throw in some high flow cats and your motor is really pushing the air out.

Lars

Shorty's will give you some gains just not the best.

There is a lot more to getting air out than the exhaust but that is good for another thread.
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Old Tue, October 27th, 2009, 10:37 PM
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Probably the best setup on the marker right now for the longtube headers.
Dynatech Header System for 2004 & up F-150 with 5.4 3V
122-622100s
Dynatech Longtube Header System including complete High-Flow Catalytic Converters & Y-pipe Assembly.

These beautiful Longtube headers are the only TRUE BOLT-ON setup available for your 2004 & up F-150 5.4 3V!!

This is a true bolt-on setup that will mate right up to any existing cat-back exhaust system, from the stock factory setup to Magnaflow, etc., cat-back exhaust systems.

Power gains will vary based upon boost level, but typically run in the area of 30 RWHP in supercharged applications running lower boost levels, a bit less in normally aspirated applications.

Far more important is what happens to the torque curve - it is extended everywhere, instead of hitting it's peak and falling off quickly, it is extended out significantly, and this aids mid-range power for anything from towing to performance applications, or even normal everyday driving situations.

No "shorty" type of header system can begin to compare to the results, effects and sound of this system, yet there is no "droning" inside the cabin. This extension of the torque curve is critically important in aiding torque & acceleration when driving hard, but also even fuel economy during normal cruising. For example, on our own 2004 5.4 3V F-150, we have averaged a gain in MPG of right at 1.0 MPG overall with or driving conditions, a result we were amazed at in our 6000 lb supercharged 5.4 3V truck!

These headers feature laser-cut flanges & mandrel bends, and are made of T304 Stainless Steel (including hardware!), use 1 5/8" tubes, Magnaflow high-flow cats, and already have both the upstream AND downstream O2 sensor bungs welded in! So all you need to do is to simply screw in all of your factory O2 sensors once you install this system, and it is very easy to install. Your OBD-II system will work as designed from the factory, no more having to run illegally by having your tuner turn off the rear O2 sensors, etc.

No ceramic coating is required due to the heat-retention characteristics of these stainless steel headers and everything fitting to the factory heat shields, etc.



No tuning changes are required from using these longtube headers in 99% of the trucks we have installed them on, unlike some other longtubes.

There is no better quality header than Dynatech - forget trying to go the cheap route with Pacesetter, etc., it's just not worth it when you can get aircraft-grade T304 S/S quality like this that will last a lifetime without cracking, etc. It's just not worth saving a few dollars at time of purchase - if you are going to install headers, do it right - do it ONCE - with Dynatech, just like we do in our own vehicles here at Troyer Performance.

Installation time generally runs about 6 hours, and some of our customers have reported getting them done in as little as 4 hours - no more 8-12 hour jobs fighting the engine height, etc., as with so many other headers for these trucks!

These Dynatech Longtube headers come with ALL hardware needed and it's of the best quality, too. You will also receive the finest quality multi-layer exhaust gaskets money can buy, the highest quality O2 sensor harness extensions and excellent step-by step instructions with plenty of photographs. You will never find an easier to install set of headers!

Dynatech - the best true longtube header system money can buy, in an easy to install bolt-on design - get yours today!

Price:* $1395.00

From Troyer Performance.
Lars
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