No mufflers?
Thread Starter
Drifting
Joined: May 2007
Posts: 1,884
Likes: 9
From: Danelaw
No mufflers?
I have an '01 Z51 with stock Cats, but no mufflers. I'm very surprised how quiet it is considering. Personally, I like it. It's not too loud, but has a nice rumble at WOT, but relatively calm at cruising speeds. Anybody else doing this? How much HP is gained without mufflers?
Thanks!
Thanks!
Intermediate
Joined: Feb 2009
Posts: 49
Likes: 0
I am running no mufflers & no cats also 
Judge the sound from the clip
http://www.youtube.com/watch?v=qtE0G0-wOxI
Judge the sound from the clip
http://www.youtube.com/watch?v=qtE0G0-wOxI
Pro
Joined: Sep 2008
Posts: 510
Likes: 0
From: oceanside CA
I have been running stright pipes for a wile and love it. I started out just cutting off the mufflers an keeping everything else the same but after a few months the gargel the car had after letting off the go peddle I ended up taking out my h pipe and just adding back in streight pipe from the cats all the way back. And let me tell ya what a differance!!!!!! Sounds great!!
Pro
Joined: Jul 2008
Posts: 553
Likes: 0
From: Toronto Ontario
I am running no mufflers & no cats also
Judge the sound from the clip
http://www.youtube.com/watch?v=qtE0G0-wOxI
Judge the sound from the clip
http://www.youtube.com/watch?v=qtE0G0-wOxI
Man that sounds just as good, if not better, than most of the expensive cat back systems!! Well done!
Le Mans Master
Joined: Jun 2004
Posts: 6,654
Likes: 5
From: Silver Spring MD
I'm running some LG LT's with random X high flow cats and the Z06 Ti Catback system. Put some electric cutouts right before the Ti system and it is obnoxious with the valves all the way open! Really wakes up the neighbors 
Drifting
Joined: Apr 2007
Posts: 1,760
Likes: 4
From: Broward County Florida
See my sig. I've got the borla x pipe and straight pipes so it's a pretty open system. I'd imagine your #'s would be close to mine. Just remember some back pressure is good. A true open exhaust may do more harm than good.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
5 Best & 5 Worst Corvette Daily Drivers
Joe Kucinski
The Headlights of Every Corvette Generation Explained
Joe Kucinski
5 Best & 5 Most Overrated Corvette Track Packages of All Time!
Joe Kucinski
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
Administrator
Joined: Mar 2001
Posts: 368,638
Likes: 24,868
From: In a parallel universe. Currently own 2014 Stingray Coupe.
C7 of the Year - Modified Finalist 2021
MO Events Coordinator
St. Jude Co-Organizer
St. Jude Donor '03 thru '26
NCM Sinkhole Donor
CI 5, 8 & 11 Veteran
I'm not sure you are gaining much in terms of HP by deleting the mufflers. The stock ones are pretty decent in terms of flow (although the sound is not the best).
Instructor
Joined: Mar 2009
Posts: 133
Likes: 1
From: City of Angels CA
I'm running a magnaflow x-pipe, with straights running out the back (dual 5" resonated tips) and i love the sound. it really is quite mild since i'm not running LT's (gotta keep it carb legal).
Pro
Joined: Sep 2007
Posts: 547
Likes: 2
From: Clinton Twp. Michigan
The pipes reduce in size just before entering the muffler and again inside the muffler. If you could see a cut away you would be shocked. Muffler is definitely restrictive. Average shown on the forum seems to be 10 to about 17 HP gain.
Burning Brakes
Joined: Sep 2007
Posts: 832
Likes: 0
From: PSL FL
I would be surprised if you gained that kind of power by just removing the mufflers, maybe after a tune too, but not just the mufflers. Anyone have some numbers they could post of before and after with no tune
Drifting
Joined: Feb 2004
Posts: 1,829
Likes: 45
From: Las Vegas Nevada
Thread Starter
Drifting
Joined: May 2007
Posts: 1,884
Likes: 9
From: Danelaw
Advanced
Joined: Apr 2009
Posts: 99
Likes: 0
From: Edmonds WA
I just peeked a look under her skirt and discovered I have 0 cats and a nearly straight thru muffler system. And Ive never seen headers that run 4 pipes halfway back before. I learn more about this car every time I drive it.
Instructor
Joined: Sep 2006
Posts: 189
Likes: 0
no mufflers
i run obx long tube headers on cats and i have welded in resonators off a Toyota v 8 truck sored from a local muffler shop quited it down from strait pipes but it still drones if i could killl the drone this would be the best exhaust that i have found the drone is a killer. at WOT it is like a C6R on the track.
Burning Brakes
Joined: Oct 2008
Posts: 1,062
Likes: 2
From: Minnesota City MN
I am running factory all the way back to my SLP Loudmouths. I like the four large tips and the sound. The bad part is once I get a set of long tubes, cats, and x-pipe it might be a little to loud....for the police not me. lol.
Intermediate
Joined: Feb 2009
Posts: 49
Likes: 0