Alex in Houston

Well, I've completed my "build" on my 2013 Sierra 5.3 6L80E with a SPT Turbo kit.
Did a build thread in the Project Forum
Click Me to read.
I've been getting the tuning dialed in slowly and it's currently running pretty damn strong @ 15psi
My issue is the "rasp" (sounds like a cherry bomb exhaust on an old pick up). When under heavy throttle - the turbo sings and it's a symphony of goodness! I absolutely despise the sound of the truck when not in boost.

I ran a 3" from the turbo to the rear bumper with a pair of DynoMaxx bullets inserted in for good measure





What's everyone here using for exhaust and how's it sound (subjective - I know)? Considering putting a resonator in line or making the system dual over the axle to help "smooth" out the exhaust note.

Thanks in advance.

FFDP

iTrader: (2)

I like vibrant ultra quiet resonators for removing rasp. They work really well.

GRRR65GTO

Well Id say you got rasp cause you basically put 2 cherry bombs for your mufflers lol

I have a 3" downpipe that goes to a 4" MBRP muffler then a diamond eye duramax cat back after that with their 4" diesel muffler, both stright through large round mufflers. I have almost no rasp I think but it still drones like a **** on the highway

_zebra

iTrader: (5)

get a straight-through (as opposed to chambered) muffler with a case to have somewhere for the sound to absorb into. my dynomax ultra flo sounds great - very smooth.

Alex in Houston

Thanks for that. I found and ordered something similar to what Vibrant was offering - a pair of magnaflows 17223 UltraFlow.

You're right

dantheman1540

x2 for the vibrant ultra quiet!

custom 68

iTrader: (8)

FFDP suggested this to me and it was like night and day. I had a short 3 inch in and out manaflow. This was installed after it due to space and it really helped.
Dave

Boost-freak

x3 for the vibrant ultra quiet!

MrJimi1121

i have the corsa cat back.. had alot of rasp .. ended up welding in the factory shorty muffler right before the corsa and now is perfect

Alex in Houston

Okay, so I was able to remove 1 of the Bullet mufflers (rear most 1) and installed 1 of the Magnaflow 17223 mufflers (the other 1 I ordered - at the exact same time and from the same place - is scheduled to come today for some reason) in it's place.
Oh gawd - It Sounds Awesome!!!
Truck went from sounding "bbblllaaaaaa" to nice and mellow hhhrooommmm. My buddy has a high dollar Borla cat back on his truck and I swear mine now sounds similar.
I'm going to return the 2nd 17223 unit as it's not needed.