I am currantly running JBA/ Gibson shorty headers along with 2 Magnaflow high flow cats, and a Magnaflow cat back wit ha 18" muffler if I was to keep the shorty's and high flows but cut off the factory "Y" and run duals to a 14" magnaflow dual in dual out and dumo it or put it out the side like a Lightning how much louder will it be?


And what preformance diffence is there better or worse?


Keep in mind the reasom I want to do this is that I think the 18" is too quiet

 

Do you have single exhaust now.I also plan on doing a lightning style exit.Looks great on a lifted truck IMO!!It should sound great and should be louder than the 18inch single.As long as you set it up correctly you should gain performance.Cut the factory Y and have that bent over the crossmember,put an X-Pipe in place,use 2 1/4 pipe all the way until your tips.
Also not sure on the muffler spacing for the DI/DO muffler???I ran 2 single Magnaflows and there is enough clearance to have no bends after the X-Pipe to your mufflers.The pipe can be perfectly straight with no bends!!Take a look in my gallery for reference.Yours will sound bad a$$ with the high flows in place,

Oh and here is what the lightning style looks like on a lifted truck....
https://www.f150online.com/forums/sh...d.php?t=301929

 

Sorry the cat back I'm running is a magnaflow single in dual out 18" and the dual in dual out has a built in x pipe so probly no need for that.

 

Just going from the 18" to a 14" maggie will sound a bit louder/deeper. Go for it

 

if i were you, cut the Y and run true duals and use either two 14" magnaflow magnapacks or two 12" dynomax bullets, then exit lightning style. should sound awesome!

 

I see now......i would still get the X-Pipe in addition to the X muffler.The X-Pipe should be placed as close to the last converter as possible.How much is that X muffler??I know you can get 2 mufflers like i'm talking about and an X-Pipe for about $180 www.performancepeddler.com

 

Kevin,

What size mufflers are you rinning 4",5",or 6" round?

And why get the X pipe if the muffler has one in it....more tourqe or??

also what I was going to at first was to get a local guy to cut off the "Y" pipe and run 2 pipes into a DIDO 14" maggie and dump it or put it out he side like a Lightning, but I'm having second thought's and might go true duals out the side with a X pipe

 

They are the 4 inch round with a 2 1/2 inch core.They are 14 inch body with 2 1/4 inch inlet/outlet.The X-Pipe being way back in the system you will not get the best results.The X-Pipe should be placed as close to the last converter as possible.I currently have mine dumped and plan to do the lightning exit as well.I can find the part ## for the mufflers if ya want??Whichever way you go it will sound great Mine is more quiet now since the 35 inch tires(turning less RPM's}Use 2 1/4 pipe all the way and make the least bends as possible.

 

Ordered my X pipe today still thinking about what mufflers to go with a DI/DO or two round or oval magnaflow's it'll either be dumped or put out the side like a Lightning haven't made my mind up yet



BTW.. Kevin, is this your part# 10425 ?

 

No my part #10415

http://www.magnaflow.com/02product/s...ne=main&id=497

Whatever you do get the short muffler and you should be very happy with it

Go to www.performancepeddler.com for cheap mufflers!!!

 

Hey Kevin,

What did you do with the rear O2 sensor that goes into the "Y" pipe ? I can see it has to be relocated but to where and what spot?

 

SKRWZ,you don't have to cut the Y that far Back!!!!No need to go that far back.I just cut it right b4 the original Y.
You didn't cut it yet did ya???

 

No I never cut it yet, I actually just got my X pipe the other day and still need to pick up my mufflers or just go to local guy here, here's a pic of the factory "Y" looking towards the rear of the truck here you can see where the O2 sensor is placed and what I am talking about

 

That looks dif from my exhaust???I have not looked at mine lately but i'll cheack it out tomarrow morning and post a pic of where my Y is cut??
SKRWZ, can you get a pic from a little farther back to show b4 the Y more???