OK i have a 4.6 in my f 150 and i wan to get the flowmaster 40 series cat back system, but the only make the it for the 5.4. IS it ok if i put theis system on my 4.6? and is there a reason why they dont make it for the 4.6?

 

slowmaster makes a kit for you the kit number is 17417 thats the single in dual out, you can save almost 300 going with magnaflow at www.hottexhaust.com cupon code fordtruck8

 

the system i want to get is $330 for the 40 series

 

i had true dual 40's on my 4.6 and loved it. Loved taking off OD and just punching while around town.

 

40series for our 4.6's (from my research and asking around) cause too much loss of pack pressure/low end torque loss... I went with 18" magnaflow and love it...

 

Does anybody else have this issue with losing back pressure and low end torque with the 40 series in a 4.6. I really want the 40 series sound.

 

I also have the 40 series on my 4.6 and have back pressure issues lost some low end torque but I love the sound these mufflers make so it will stay on there till it starts to rust also noticed as drop in my rpms at a stand still but not that bad if you love great sound then I would put the 40 series on if you want more performance then put a managflow on but they are a bit quiter then the flowmaster hopes this helps you out some with your desion.

 

I have the 40 series on my 2002 4.6 4x4 and have no problem with the back pressure now. I did when I had no tailpipes and it was much louder then too. I put some tail pipes on and now it is quieter in the cab and a little quieter outside the truck but I can tell a big difference in driving now and it seems much more responsive. I would recomend flowmaster to anyone wanting good sound from there truck or car or suv.

 

im gonna go with the 40. Did u just order the kit for the 5.4?

 

The original 40 series sounds really good on the 4.6L. You will not get the same sound/exhaust tone as the 5.4L, but you will be happy.

I have the original 40 "3 inch SI/SO" (part # 43041) exiting in front of the pass rear tire. I have a mandrel bent exit pipe with a F/M 3.5 inch tip. I may try the super 40 just for a comparision test. I had the 40 series delta flow for about 3 months and swapped that for the original.

Good luck to you my freind...

 

Just installed ( yesterday ) a 40 series Flowmaster SI/DO and it souds great.
You'll love it!