whhaaazupp

I have a 04 4.6 XLT also, and I put a modified flowmaster 40sr on it. instead of the standard 2.5" pipes they put on it, I had them put 3" pipes and instead of 45 degreeing it, they straightpiped it. Since I did this, I have noticed that when I accelerate my truck seems to be lighter, but I think thats due to the couple extra horses I got from it. I didnt increase the air in-flow at all, and I dont seem to be having problems with that, then again, all my mods to the truck have been done in the last 4 months since I got back from Iraq, so I don't really have a point of view to compare it too. But, The acceleration is smoother, and the engine seems to shift more smoothly since I put my Flows on it ..

ford_anger 01

im running 2.5 and its just a single but soon im gonna do from headers back

Uncle Jesse

I am getting the Magnaflow kit at some point. I have heard a few trucks, nice rumble under acceleration, but not mind numbing loud. Plus, you don't lose any low-end torque, these trucks can't afford to lose torque.

92custom

go with the borla's more expensive but i have heard that they just sound BAD or PIMP

whitecrystal1

I would pick a Flowmaster over the Borla, But I would go with maggies first over both of those from all the post I've read.

ford_anger 01

ive heard that the magnaflow tends to blow out the stuffing after a while so thats why i went with and am gonna stay with flowmaster its a 100% steel no stuffing just mig welded baffles

LovetheTide

I thought glasspacks were the only muffler that would blow anything(packing etc.) out over time?

ford_anger 01

idk i have had friends that have told me from expierence that they blow stuffing out but then again they dony know what they buy so very could have had a glasspack

LovetheTide

haha not knowing what you buy doesnt help

Ty

most likely a glass pack.

most people will try to blow the packing out, fill it with water, then reving it will blow most of the packing right out.