someotherguy

His post is 3.5 years old; if he's been hammering a 5.7 Vortec around to hear his loud muffler, it's probably not running anymore.. I mean.. he hasn't been back since :/

Richard

dantheman1540

So raspy the original poster lost his ability to type and has not been able to post since mid 2017

nicksmontano

Figured that much but didn't hurt to try, there isn't a whole lot of videos of L31 vortec with spintech mufflers, trying to decide on a series currently.

2002_Z28_Six_Speed

iTrader: (20)

The Denali still has its SpinTech and its still loud. I might get one for the Sierra. LOL

nicksmontano

Post a Sound clip. I ordered the spintech pro 9000, dual 2.5" in/out, will post a video after it arrives.

The_W

I have long tube headers, no cats, with 2.5 inch pipe going to two 9000's out the back. Since its going out the back its not loud in the cab, some rasp but not horrible. My only complaint is since I have a manual it pops/backfires a ton on letting off the gas or shifting gears. The exhaust is too free flowing more than likely. May put resonator or high flows cats to help. Already tried to tune it out. But I like the 9000's.

dantheman1540

That sucker is loud even with the vibrant "Ultra quiets" on the end. Those little Vibrants seriously knock down sound so I'm assuming the Spintech does nothing at all lol

The_W

Dont want to hijack thread but since we are subject of exhaust, anyone know how I can stop the popping/backfire of my exhaust? So many threads out there on it but people have just tuned it out mainly with DFCO.

tjmath

On the truck in your sig? If so, my personal opinion is that your exhaust is too small. Needs to breathe more.

The_W

Really?? Yea it’s the truck in the signature, I figured it was too free flowing. I am only running 400hp with 1 7/8 headers and 2.5 inch pipe. Usually don’t run something like this until your bigger cubes or boost I thought.