Just finished installing speed engineering longtubes and ory on my 2008 4wd 5.3. They fit like a glove with zero problems! I ordered kooks clamps however, way better quality. Just figured id post if anyones considering them with a 4x4.

 

Did you install the 1 3/4" headers or the 1 7/8" headers? No issues with the 02 sensor location?

Also, did you install Speed Engineerings y pipe as well?

 

i agree with vmaxpro..i installed a set on my 08 z71 and they were perfect..not fitment issues plenty of clearance..the o2 location is good its close to the floor but nothing to worry about..and the y pipe fit well and had plenty of clearance as well

 

1 3/4 with their ory. o2 on driver side is really close though about 1/4 inch. Im pretty happy with them, im sure arh's are superior but for well under 400$ and easy install I cant complain.

 

Timely post...mine should be here any day and I cant wait to get them in. Glad to hear they fit so well.

How much louder are they than stock manifolds?

 

Not real sure, I went from stock to lts and xr1 dumped. Great sound low rumble at idle and barks up top. Just need a tune really bad now runs like crap

 

i think the sound depends on your exhaust setup..i have a 22in case magnaflow and its pretty quiet at idle but when you get on it really wakes up..i had a 14in magnaflow on it before and with longtubes it was LOUD!

 

With the same 2.5" catback installed, my LT's and ORY were MUCH louder than my stock manifolds. This was with my cam installed.

The same LT/ORY setup actually got QUIETER after I installed my bigger 3" catback with a slightly longer and bigger body muffler. Both mufflers are straight through design.

 

Not the same truck or anything but when I had my diesel I had a 40" straight through muffler and cat on the stock 4" exhaust pipe and it would always drone. I removed the cat and replaced it with a straight pipe and the drone went away as well as all of the interior noise in general.

Point of the story is no two exhausts are the same and depending on the setup things can vary and not necessarily in the way you'd think.

 

Glad I saw this before I posted a "who's running speed engineering long tubes".....lol
I though I read here someplace that they have made some changes to the headers. One of them was the location of the o2 sensor?