Notices
Generation III External Engine LS1 | LS6 | Bolt-Ons | Intakes | Exhaust | Ignition | Accessories
Sponsored by:
Sponsored by:
Old 04-25-2016, 04:07 PM
How-Tos on this Topic
Last edit by: IB Advertising
See related guides and technical advice from our community experts:

Browse all: Air Intake and Exhaust Guides
Print Wikipost

True Duals, questions answered here. Post YOUR information and pics too!

 
Old 05-30-2018, 04:40 PM
  #1341  
Staging Lane
 
Join Date: Feb 2017
Posts: 57
Default Muffler flow check

Hey all. Ws6 w 600 lift cam and lots of overlap. Have 1 7/8 lt w an un catted ypipe 3" all the way back to a flowmaster SUV muffler (creative piping). Volune is acceptable (louder than stock but neighbors dont mind). Rasp is not acceptable.

ordered SE true duals over axle...expected saturday. Been reading about everyone's set up. Borla xr1, magnaflow rounds (can't tell if race or perf muff is quieter), pipes m80, auger looking thing, cones, etc). I'm worried anything straight through would still be loud since the flowmaster fbody muff orig on car was WAY too loud for me. I also plan on 550rwhp motor upgrade soon..maybe w a tamer cam...maybe.

the one muffler I keep coming back to is the dynomax sup turbo round w 18" body (17698). "If" this works id need new, shorter tips. But this muffler has a 700scfm rating while all the straight throughs are about tripple that. Will a pair of these mufflers rob me of a significant amount power? Any advice is appreciated. Thanks for supporting sponsors who provide great products.

I posted a similar question on the SE TD thread and high flow cats were suggested. I bought one (flowmaster stubby looking thing $50) and put it on my current set up to test out and it sounds even better to me...still some rasp...BUT...HUGE power loss..i realize 2 high flows won't be as bad but I may have been scared away from having any cats at all.

any guidance or alleviation is appreciated.
Pbarby is offline  
Old 06-14-2018, 01:41 AM
  #1342  
Teching In
 
Join Date: Feb 2018
Posts: 15
Question info need, please help.

I have noticed alot of AWESOME pictures of good looking rides. I have a LQ4 in a 1988 c1500. I will have to run my duels down the passenger side because of the gas tank. my question is, will the fact that the drivers side tubing will be longer over all effect any performance? will a "X" or "H" solve this? or am i just over thinking this?
LQ4C1500 is offline  
Old 06-14-2018, 09:53 AM
  #1343  
TECH Senior Member
 
Join Date: Jun 2016
Location: Central Cal.
Posts: 10,526
Default

Don't worry about it, but go ahead and run an H or X pipe as it will give you more power and will smooth the tone some.
G Atsma is offline  
Old 06-14-2018, 11:34 AM
  #1344  
Teching In
 
Join Date: Feb 2018
Posts: 15
Default

ok thank you very much
LQ4C1500 is offline  
Old 06-14-2018, 12:34 PM
  #1345  
TECH Junkie
iTrader: (11)
 
Full-Force's Avatar
 
Join Date: Aug 2004
Location: Upstate of SC
Posts: 3,054
Default

Originally Posted by TheNutDriver View Post
Ok, i have a question! I see a lot of reference to the "machine gun" sound around 3k rpm with the true duals and bullet muffler style exhausts. Is this the norm for these systems? I've just had a true dual with bullets and x pipe made here in the UK in the style of Kooks/Speed engineering duals and i have this "machine gun" type noise at around 3k.
Its more of an LS1 with unequal length exhaust characteristic. Corvettes with the same engine said different. People used to think duals didnt do this but once these systems started becoming available that exited out the rear and only had a bullet style muffler to tame it down then it became clear that even duals did this. I have know this for 12 years when I started building exhaust for these cars. I can build a y pipe setup dumped and a dual x pipe setup dumped, blindfold you, and you will not be able to tell me which one is single vs dual. Having it dumped uses the underside of the car and ground as an echo chamber that soaks up alot of the tone that most people hate that they hear when the exhaust exits out the back into open air. The downside of course is now its much louder inside the car.
Full-Force is offline  
Old 01-03-2019, 08:43 PM
  #1346  
TECH Fanatic
iTrader: (4)
 
trilkb's Avatar
 
Join Date: Jul 2005
Posts: 1,739
Default

Anyone running speed engineering true dual full system with pacesetter long tubes? PM me or reply if you are. Trying to check fitment.
trilkb is offline  
Old 02-13-2019, 01:06 AM
  #1347  
Teching In
 
Join Date: Feb 2019
Posts: 4
Default

Just got my tsp long tubes and their rumbler true dual setup. The dumped version not the rear exit. Should be going on soon ill post some pics for anyone interested.
Dorito23 is offline  
Old 05-05-2019, 10:04 AM
  #1348  
Launching!
iTrader: (1)
 
Join Date: Sep 2016
Location: Leicester, United Kingdom
Posts: 289
Default

For people who are running catalytic converters on the end of their collectors, have you ran into any issues with heat transfer to the floorboards ? I’ve been thinking of adding some high flow cats to try and knock some of the exhaust smell off as my wife won’t go in the car with me and it stinks the garage out. Only issue I can see is that with the cats fitted (Magnaflow 59956 or similar) the drivers side one will only be about an inch at most from the floorboard beneath the drivers legs. Can imagine it’ll get very hot? Don’t want to set fire to my carpet.
TheNutDriver is offline  
Old 05-05-2019, 10:15 AM
  #1349  
TECH Senior Member
 
Join Date: Jun 2016
Location: Central Cal.
Posts: 10,526
Default

Strap some heat shields to the converters. They do help.
G Atsma is offline  
Old 05-05-2019, 11:14 AM
  #1350  
TECH Fanatic
iTrader: (5)
 
lees02WS6's Avatar
 
Join Date: Mar 2004
Location: Lansdale, PA
Posts: 1,392
Default

Originally Posted by TheNutDriver View Post
For people who are running catalytic converters on the end of their collectors, have you ran into any issues with heat transfer to the floorboards ? Iíve been thinking of adding some high flow cats to try and knock some of the exhaust smell off as my wife wonít go in the car with me and it stinks the garage out. Only issue I can see is that with the cats fitted (Magnaflow 59956 or similar) the drivers side one will only be about an inch at most from the floorboard beneath the drivers legs. Can imagine itíll get very hot? Donít want to set fire to my carpet.
I have mine tucked up close to the floor board, and have not noticed additional heat, I did also ceramic coat them. You could apply heat shielding above it.

lees02WS6 is offline  
Old 05-06-2019, 02:00 PM
  #1351  
Launching!
iTrader: (1)
 
Join Date: Sep 2016
Location: Leicester, United Kingdom
Posts: 289
Default

Thanks gents, I’ll get some of that heat shield mat.
TheNutDriver is offline  
Old 05-10-2019, 09:57 AM
  #1352  
12 Second Club
iTrader: (3)
 
buddha845's Avatar
 
Join Date: Dec 2005
Location: Tampa, FL
Posts: 318
Default

Originally Posted by lees02WS6 View Post
I have mine tucked up close to the floor board, and have not noticed additional heat, I did also ceramic coat them. You could apply heat shielding above it.
How much did the ceramic coat cost you? DIY?
buddha845 is offline  
Old 05-10-2019, 10:03 AM
  #1353  
TECH Fanatic
iTrader: (5)
 
lees02WS6's Avatar
 
Join Date: Mar 2004
Location: Lansdale, PA
Posts: 1,392
Default

Originally Posted by buddha845 View Post
How much did the ceramic coat cost you? DIY?
. $400, cats to just before the tips

lees02WS6 is offline  
Old 05-10-2019, 10:14 AM
  #1354  
12 Second Club
iTrader: (3)
 
buddha845's Avatar
 
Join Date: Dec 2005
Location: Tampa, FL
Posts: 318
Default

Originally Posted by lees02WS6 View Post
. $400, cats to just before the tips
Awesome, thank you
buddha845 is offline  
Old 06-04-2019, 10:24 PM
  #1355  
Launching!
iTrader: (1)
 
Gripenfelter's Avatar
 
Join Date: Oct 2002
Location: Winnipeg, Manitoba, Canada
Posts: 292
Default Speed Engineering True Duals with cats on a lowered car

My WS6 is lowered 1.5”. I'm running Speed Engineering True Duals. The bolts that come with the kit are absolutely useless. You can't get them tight enough without stripping them. If you leave them loose the pipes come apart. I lose a wideband O2 that way. I upgraded the bolts to stage 8 bolts and also welded a tag on each piece of pipe at the lips to keep them from moving.

It’s a heads and cam car with a 228/228 cam and trick flow heads. Idles a little high at 950 rpm. Needs some tuning. Video doesn't do it justice. It sounds amazing and I get compliments from everyone. Sounds very refined with the cats. It's still loud and will set car alarms off but doesn't have that ratchety straight pipe crackle.

I added high flow cats to smoothen out the sound and also welded it up on the hangers to get extra clearance. Had to clearance the torque arm as well. No extra heat from cats.








Last edited by Gripenfelter; 06-05-2019 at 08:48 AM.
Gripenfelter is offline  

Thread Tools
Search this Thread
Quick Reply: True Duals, questions answered here. Post YOUR information and pics too!


About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: