I have an 05 Supercrew 5.4L with a CAT back exhaust (Flowmaster), K&N air intake and a programmer. If I add an X-pipe into the mix will I notice any difference in torque/horsepower etc? Thanks in advance for the help

 

An x pipe is something you would have in a true dual setup. If you just have a cat back it would be a si/do setup. You will have to have a true dual setup installed, which will not have enough gains to warrant the cost.

 

x2, and man it has been awhile since I seen your ID posting on here!

 

Yeah, I have found another F150 and thought I would come back around. I have a couple mustangs and been playing with those but have really been missing a truck.

 

Sweet, welcome back! I had dual Magnaflow 11" mufflers on my previous 2004, finally tried out the Magnapack on my current truck and like it. If I ever change it i'll be trying the Borla round body XR1.

 

My videos are with duals and an X pipe. No increase in power, but smoother more refined tone with less rasp and crackle. Compared to duals with no crossover.

 

I was told by a top mod motor guy that true duals on a mod motor truck are a waste of money. He explained it that with a good aftermarket single 3" inlet dual 2 1/2" outlet cat back setup the truck would perform just as well and on certain applications even slightly better than true duals. Not sure of the truth on this but he builds and tunes tons of late model mod motor vehicles so I'm going to stick with that setup for now.

 

^ The truth is, no exhaust makes a noticeable improvement in performance. If your planning an exhaust system, plan for sound, because that is all you will notice.

 

On a true dual set up the X-pipe will improve scavenging which will aid in the motors ability to rap faster. True duals will also move your power band up a little bit. Depending on what you have done to the engine,IE cams, will determine weather or not it will help you or not. In a High rev and Higher flash converter it will help. In a bone stock set up it will be more for sound Which has to be psychologically is great for 30 horse....lol

 

For starters as mentioned you will have to change your cat back setup to allow for true duals. Also im not sure as to why people on here are saying you will not notice a difference. Your engine is literally a giant air pump and anything you can do to make that air flow easier and faster will improve performance. By getting true duals via a x pipe you are not only allowing for easier air flow but you are also reducing back pressure. With OHC engines you want some back pressure but you could get long tubes true duals and no cats and still be getting the back pressure you need. Only when you run straight pipes or open headers are you more likely hurting your performance. The power difference may not be neck snapping but there will be a difference especially if you let someone with engine tuning experience get ahold of it and custom tune for the increased air flow. Also if you are getting rid of the air from the engine you might as well have a CAI also such as AFE (best on the market in my opinion) which increases the the air flow in.

 

No but some stickers will sure help

 

Straights won't hurt an engine, pretty much the same setup as direct flow mufflers. If anything direct flow mufflers are worse than straights since the perforated tubing allows for some static pressure to escape inside the muffler some, thus resulting in a slow, long break in point for the muffler burning out the nearest portion of wrapped packing.

True duals only help the higher end band, on a 6,000 pound truck the single intermediate pipe system and a single muffler with one tailpipe, or even two for the dual look, is a much better choice for keeping the low end energy retained, specifically important for towing. The only dual setup that can keep low end torque curve that good would be a mandrel bent 2.25" exhaust, x piped with direct flowing mufflers. It must be mandrel.