Exhaust with Cold Air and DiabloSport
 

I've got an 06 5.4L XLT 4×4. I tow rarely but do go play in the mud and hills off and on. I have a K&N 57 FIPK, E3 plugs, Accel coils, and DiabloSport inTune currently set on 87 K&N Performance (but next gas tank I'm gonna try 93 tune!). My exhaust is factory but stops right after the muffler. Everywhere I read says to upgrade exhaust to balance the breathing with the intake. Is my lack of pipes enough or do I need to upgrade headers, cats, muffler, etc. too? I want performance but to also balance mpg too. I plan on this being my lifetime truck so any advice is appreciated.

For starters, you need to open it up after the CAT, Magnaflow makes a good system. You could also swap out the cats with freeflow ones from Magnaflow as well. Air in exhaust out, the more the better.

How u like the accel coils? I have them and notice sum extra power . A lot of guys on here shy awAy from them but I've had good luck with them . And as far as exhaust goes set ur self up with a nice catback system magma flow makes a good set up. Try to stay away from removing cats and stuff I got mine kicked out Infront of the back tire . U can have a short exhaust just make sure u keep cats and muffler .

I did that once on an old 67 Chevy C30, put the pipe in front of the tire, and the hot exhaust turned the tire to mush. LOL

You think ignition coils gave you more power? :eek:


I dumped the cats and installed spacers on the rear o2 sensors to keep the check engine light out. Then I got a Turbo big block muffler I can stick my arm through and ran it out in front of the right rear tire. Sounds sick. Im getting almost 14 mpg at 60mph on 38s. And I have the same tunner as you.

Im on 33x12.5/17s with Rancho RS9000XLs so about 2inches of lift up front. Big cattle guard and whole truck's Rhino lined so a lotta weight to deal with too. I was 11.5mpg before any changes. Now Im around 14.
I like the Accels pretty well. They may not have given more power, but they certainly let me use more that I had. I could feel a difference too.
Another question - when I upgrade my muffler, how and why would having pipes come from it help as opposed to no pipes after the muffler? I obviously dont know much about exhaust flow... just dont understand how could breath better through 4-8 feet of pipes vs wide open

I'll be upgrading muffler either way, just curious about the after pipes and how they work

Thanks for the responses by the way. So far Im looking at going with Magnaflow muffler

If you remove too much pipe you loose back pressure and that makes you loose power

Yes mAybe not so much power but def throttle response . U should try them then u can say sumthin. Msd makes a nice also

Thanks Sandstorm - thats exactly what I was looking for. After searching through other threads, Ive decided on MBRP S5200409. Thanks everyone for the input!