Mountaintop

So I just got my truck build together. 05 2500hd ecsb. Put a lq9 with 799 heads and a btr truck cam in it. It has 1 7/8 speed engineering headers run into an x pipe then into two black widow venom 250 mufflers dumped over the rear axle. It has a great idle sound but has a obnoxious rasp under load. I have no cats and I have no room for resonators in front of mufflers. Is it possible to add a bullet style behind the mufflers to kill some rasp. I would extend it out with tail pipes basically the bullets would sit where the spare tire belongs. Another idea I heard was adding supertrap tunable mufflers at the tips. Any thoughts are appreciated. Also if it makes a difference the truck has just a base tune.

FFDP

iTrader: (2)

You have the room after the mufflers, so I would add two resonators there. It should help a lot with rasp.

Mountaintop

Thanks. I did some searching but hadn’t found anything saying if a resonator will help with rasp when’s it’s after the mufflers.

FFDP

iTrader: (2)

It'll still help no matter where it's installed, it will still absorb the sound waves to lessen the rasp/drone.

00pooterSS

iTrader: (40)

Or change the current mufflers to large case magnaflows

I have speed engineering headers, single 3.5" exhaust and a magnaflow 22" muffler (part number 12909) and I can barely even hear my exhaust it's barely louder than stock

_zebra

iTrader: (5)

i even had a medium-length (14-19"... somewhere around there) Dynomax straight-through with LTs & no cats.
sounded great without being raspy. my chambered MellowTone before that got pretty raspy, though - especially after the headers.

i think it's the difference in chambered vs straight with perforations & packing.

dantheman1540

Vibrant ultra flow resonators help a ton with rasp and are pretty small.

00pooterSS

iTrader: (40)

I forgot to mention I do have the stock resonator. I didn't think it helped that much so I recommended mufflers instead. But to be honest, I don't know, I haven't done much resonator testing. I have had several muffler setups.

I figured if it was really bad that a resonator wouldn't be enough. But again I can't say for certain.

Jjblur

Remove the x pipe and replace with h pipe. X pipes are known,for their raspy high pitched tone. H pipes are deeper

1994Vmax

iTrader: (4)

Muffler choice and no tailpipes. X pipe has nothing to do with it either... that's just rubbish. I have 3" duals on my 04 off 1 7/8" speed engineering long tubes to an X pipe with larger case Borla XR1s and tailpipes on a 45 out the rear of the truck. No rasp.. period. In fact its borderline too quiet however I appreciate that and don't want loud anyway.