2004 Silverado: Replace muffler or true duals? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


GMC/Chevrolet Truck/SUV When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made.

Reply
 
 
 
Thread Tools Search this Thread
Old 12-14-2011, 10:27 PM   #11
Senior Member
True Car Nut
Thread Starter
 
MouSe's Avatar
 
Join Date: Oct 2009
Location: Atlanta
Posts: 5,988
Thanked 2 Times in 2 Posts
MouSe is on a distinguished road
Default

That'* what I was thinking. Was watching Gearz the other day and they said 2.5" is what you want for singles OR duals for a motor with 250+ HP.

If I replace the muff and get headers I'll be close to 350.
MouSe is offline   Reply With Quote
Old 12-15-2011, 07:22 AM   #12
Senior Member
True Car Nut
 
jwfirebird's Avatar
 
Join Date: Dec 2009
Location: western,ny state
Posts: 9,616
Thanked 563 Times in 481 Posts
jwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond repute
Default

you should think about getting your own HPT. you can program out the downstream o2'* and get rid of the cat altogether. you may need to adjust it when you start changing stuff around anyway. you are also going to have to do something with the evap vent valve, you could remote mount it or if you had hpt you could shut it off.
jwfirebird is offline   Reply With Quote
Old 12-15-2011, 09:44 AM   #13
Senior Member
True Car Nut
Thread Starter
 
MouSe's Avatar
 
Join Date: Oct 2009
Location: Atlanta
Posts: 5,988
Thanked 2 Times in 2 Posts
MouSe is on a distinguished road
Default

Quote:
Originally Posted by jwfirebird View Post
you should think about getting your own HPT. you can program out the downstream o2'* and get rid of the cat altogether. you may need to adjust it when you start changing stuff around anyway. you are also going to have to do something with the evap vent valve, you could remote mount it or if you had hpt you could shut it off.
Yeah, I'll need a tuner eventually. Can't get rid of the cats though. Where I live in Georgia (Atlanta) does emissions inspections and looks for the cats. When I move to MO it'll be similar, no emissions but they look for the cats. Really freaking sucks.

Like I said though, the headers come with all the needed emissions stuff. The only thing I have to do is relocate the factory cats or buy some new ones.
MouSe is offline   Reply With Quote
Old 12-15-2011, 10:05 AM   #14
Senior Member
Posts like a Northstar
 
silversurfer's Avatar
 
Join Date: Mar 2010
Location: Neligh, Nebraska
Posts: 596
Thanked 2 Times in 2 Posts
silversurfer is on a distinguished road
Default

I say do the setup you were thinking of with the true duals. It all also depends on how loud you want it. We put a 4" single ss pipe and high flow cats, high flow muffler on my uncles 2500 HD, and you can hear it over 5 miles away in the country. It gained power and torque from that, granted the stock system was junk and had the engine at 30% load at idle, but it'* loud and doesn't take much to get a headache from it. It sure sounds good though..but try to explain that to your neighbors when you start it up in the morning lol.

As far as relocating your cats, you might need some o2 sensor extensions if you don't tune them out. Better make sure they're included in that kit.
silversurfer is offline   Reply With Quote
Old 12-15-2011, 10:35 AM   #15
certified crazy person
Certified GM nut
 
eltatertoto's Avatar
 
Join Date: Sep 2010
Location: hobart indiana (1 hr from chicago)
Posts: 1,871
Thanked 64 Times in 52 Posts
eltatertoto is a jewel in the rougheltatertoto is a jewel in the rougheltatertoto is a jewel in the rougheltatertoto is a jewel in the rough
Default

could always do it the redneck way... program out the cats and just hollow out their shells. in indiana they put you on the obd2 while you are over a pit with someone inspecting your **** from underneath. its a royal pita. and if you have a diesel they make you do that plus run on the rollers.
eltatertoto is offline   Reply With Quote
Old 12-15-2011, 10:36 AM   #16
Senior Member
True Car Nut
Thread Starter
 
MouSe's Avatar
 
Join Date: Oct 2009
Location: Atlanta
Posts: 5,988
Thanked 2 Times in 2 Posts
MouSe is on a distinguished road
Default

If you watch that video, that'* the perfect loudness.

The more I think about it, the less I'm wanting to do true duals. That'* a lot of money for a motor that'* not going to be used for racing. I mean I eventually want to take apart the engine to port and polish everything, but until then an exhaust that flows THAT well just isn't worth it. I'm not gonna run forced induction of any kind, and all of my engine mods will be to increase MPG and if HP goes up too, awesome.
MouSe is offline   Reply With Quote
Old 12-15-2011, 10:38 AM   #17
Senior Member
True Car Nut
Thread Starter
 
MouSe's Avatar
 
Join Date: Oct 2009
Location: Atlanta
Posts: 5,988
Thanked 2 Times in 2 Posts
MouSe is on a distinguished road
Default

Quote:
Originally Posted by eltatertoto View Post
could always do it the redneck way... program out the cats and just hollow out their shells. in indiana they put you on the obd2 while you are over a pit with someone inspecting your **** from underneath. its a royal pita. and if you have a diesel they make you do that plus run on the rollers.
That'* how the Metro area in and around Atlanta does it. Luckily though I found an inspector who won't look under my truck, just run the computer. They have rollers, but I don't know what for. Diesels aren't required emissions inspections.
MouSe is offline   Reply With Quote
Old 12-15-2011, 11:00 AM   #18
Senior Member
Posts like a Northstar
 
silversurfer's Avatar
 
Join Date: Mar 2010
Location: Neligh, Nebraska
Posts: 596
Thanked 2 Times in 2 Posts
silversurfer is on a distinguished road
Default

The number 1 reason why I don't want to leave Nebraska: no Emission inspections west of lincoln if that far..That'* about the only reason why I'd stay in this state
silversurfer is offline   Reply With Quote
Old 12-15-2011, 11:14 AM   #19
Senior Member
True Car Nut
Thread Starter
 
MouSe's Avatar
 
Join Date: Oct 2009
Location: Atlanta
Posts: 5,988
Thanked 2 Times in 2 Posts
MouSe is on a distinguished road
Default

Florida: no inspections of any kind.
MouSe is offline   Reply With Quote
Old 12-15-2011, 12:28 PM   #20
certified crazy person
Certified GM nut
 
eltatertoto's Avatar
 
Join Date: Sep 2010
Location: hobart indiana (1 hr from chicago)
Posts: 1,871
Thanked 64 Times in 52 Posts
eltatertoto is a jewel in the rougheltatertoto is a jewel in the rougheltatertoto is a jewel in the rougheltatertoto is a jewel in the rough
Default

even indiana doesnt have them except for porter and lake counties. (the ones on the lake) shelby county where memphis is has to but the rest of the area doesn't. and according to lauren birmingham never made her do emissions tests or anything like that.
eltatertoto is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Running duals on a 92 SE IronWolfe11 Performance, Brainstorming & Tuning 3 03-14-2010 01:58 AM
Duals for an SE Timeshifter Performance, Brainstorming & Tuning 3 01-21-2005 03:50 PM
I've got my duals! 86V8 Classics (Star Chief and 1957 to 1986) 7 07-14-2004 11:34 PM
Duals or No Duals big_boss2010 Performance, Brainstorming & Tuning 4 04-10-2004 07:52 PM
Duals on pre 92 PontiacXcitement 1992-1999 4 11-14-2002 09:52 PM


Tags
dual, exhaust, flowmaster, horse power, silverado

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 01:13 PM.


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.