Forced Induction Superchargers | Turbochargers | Intercoolers

Guys running 4 Inch down pipes...

Thread Tools
 
Search this Thread
 
Old Nov 19, 2005 | 11:53 AM
  #1  
2000 Tran Zam's Avatar
Thread Starter
TECH Addict
iTrader: (2)
 
Joined: Jul 2004
Posts: 2,333
Likes: 0
From: Ahwatukee, Az
Default Guys running 4 Inch down pipes...

Just curious if you were familiar with a company that makes catylitic converter shells that fit over 4 inch piping?

Im just worried that they might give me **** for not having cats.

I just need to pass visual, not the sniffer.

Allan moved the muffler towards the middle to make it look like thats the cat, but im not sure if it will fool them.


anyone have any experience with this?
Reply
Old Nov 19, 2005 | 12:16 PM
  #2  
gator's 99TA's Avatar
TECH Senior Member
iTrader: (2)
 
Joined: Nov 2001
Posts: 9,971
Likes: 2
From: Tampa Bay
Default

they make diesel 4" cats. they are huge. probably takes a couple huge hangers to hold it up.
Reply
Old Nov 19, 2005 | 12:17 PM
  #3  
SuperZ's Avatar
9 Second Club
iTrader: (2)
 
Joined: Nov 2004
Posts: 1,205
Likes: 0
From: Amarillo,TX
Default

Are you going to run the 4inch pipe all the way back.On mine I have a 4inch DP that necks down to 3inch by the tranny.If you did that you could have the converter over then 3inch pipe.
Reply
Old Nov 19, 2005 | 01:09 PM
  #4  
69firebird's Avatar
TECH Addict
iTrader: (14)
 
Joined: Nov 2002
Posts: 2,560
Likes: 0
From: hurst tx
Default

or if you wanted to fool em, you could get a 4" bullet and put it up towards the front of hte car, that could possibly fool em
Reply
Old Nov 19, 2005 | 05:25 PM
  #5  
smokinHawk's Avatar
TECH Senior Member
iTrader: (48)
 
Joined: Jan 2002
Posts: 7,354
Likes: 1
From: Columbus, ohio
Default

i dont have to pass emissions, but i was thinking if i ever have to then i was going to do what 69firebird said, i have a bullet muffler 4" near the front, then it will go towards the rear tire, then neck down to 3" around the rear axel into a cat back, on race day the cat back will get removed and it will be a 4" exhaust to the rear tire with a turn id just say my bullet is a cat, not sure if it would work
Reply
Old Nov 19, 2005 | 06:28 PM
  #6  
White.Lightning's Avatar
TECH Addict
iTrader: (53)
 
Joined: Mar 2005
Posts: 2,863
Likes: 1
From: Aston, PA
Default

Another option is to have a smaller, emissions compliant DP w/ a cat and exhaust come time for inspection. It won't take all that much time to get it "ready" for inspection/emissions. I do it every year.

Good luck
Andy
Reply
Old Nov 19, 2005 | 07:37 PM
  #7  
FastKat's Avatar
TECH Addict
iTrader: (10)
 
Joined: May 2005
Posts: 2,487
Likes: 2
From: Pittsburgh, PA
Default

why don't you want to split it down into two 3's?
Reply
Old Nov 20, 2005 | 09:37 AM
  #8  
smokinHawk's Avatar
TECH Senior Member
iTrader: (48)
 
Joined: Jan 2002
Posts: 7,354
Likes: 1
From: Columbus, ohio
Default

if you have all the exhaust connections with Vbands like i do you can easily swap out sections, and have like an emissions section where it tapers down to a 3" cat, then when your done with that, put in a 4" section back
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-1

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-2

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
Old Nov 20, 2005 | 01:02 PM
  #9  
2000 Tran Zam's Avatar
Thread Starter
TECH Addict
iTrader: (2)
 
Joined: Jul 2004
Posts: 2,333
Likes: 0
From: Ahwatukee, Az
Default

from what i know, allan just ran 4 inch piping all the way back out the passenger side. he said it would have been too close to the fuel stuff to split it up to dual 3 inch pipes, or something like that.
Reply




All times are GMT -5. The time now is 02:14 PM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE