LS1TECH - Camaro and Firebird Forum Discussion

Forced Induction Superchargers | Turbochargers | Intercoolers

pt91.5

Thread Tools
 
Search this Thread
 
Old Aug 13, 2008 | 02:45 PM
Share
  #1  
bumpin_records's Avatar
bumpin_records
Thread Starter
TECH Resident
iTrader: (19)
 
Joined: Jan 2004
Posts: 802
Likes: 2
From: chicago
Default pt91.5
Im in the process of making my downpipe and i was wandering if 4" is ok or would that be too small, its just that going witha 5" is gonna be a lot harder to fabricate and run though the kmember tubular and engine.
Reply
0
Old Aug 13, 2008 | 02:54 PM
Share
  #2  
Mr.MartyStone's Avatar
Mr.MartyStone
TECH Enthusiast
iTrader: (12)
 
Joined: Jan 2007
Posts: 659
Likes: 1
From: Screwston, TX
Default
If it were easy everone would do it. Seriously though if you can make it work i would run the biggest DP available.

Nate
Reply
0
Old Aug 13, 2008 | 03:17 PM
Share
  #3  
Hennytime's Avatar
Hennytime
12 Second Club
iTrader: (33)
 
Joined: Jan 2005
Posts: 2,584
Likes: 0
From: winter springs, fl
Default
supposedly bmrs turbo k member will fit a 5" dp no problem
Reply
0
Old Aug 13, 2008 | 03:24 PM
Share
  #4  
98transguy's Avatar
98transguy
TECH Enthusiast
iTrader: (7)
 
Joined: Feb 2005
Posts: 735
Likes: 0
From: new hudson,mi
Default
OFI has a kit that fits a 5" downpipe on passenger side, i am sure u can fit a 5" .Just take the extra time and do the 5"
Reply
0
Old Aug 13, 2008 | 03:40 PM
Share
  #5  
smokinHawk's Avatar
smokinHawk
TECH Senior Member
iTrader: (48)
 
Joined: Jan 2002
Posts: 7,354
Likes: 1
From: Columbus, ohio
Default
4" will probably be ok.
allot of big power cars run a 4"
Reply
0
Old Aug 13, 2008 | 04:22 PM
Share
  #6  
blown454ss's Avatar
blown454ss
Staging Lane
 
Joined: May 2005
Posts: 57
Likes: 0
From: omaha ne
Default
Originally Posted by smokinHawk
4" will probably be ok.
allot of big power cars run a 4"
agreed
Reply
0
Old Aug 13, 2008 | 05:11 PM
Share
  #7  
bumpin_records's Avatar
bumpin_records
Thread Starter
TECH Resident
iTrader: (19)
 
Joined: Jan 2004
Posts: 802
Likes: 2
From: chicago
Default
thanks all im gonna sit back and think this one out
Reply
0

Trending Topics

Old Aug 13, 2008 | 06:58 PM
Share
  #8  
Shawn @ VA Speed's Avatar
Shawn @ VA Speed
FormerVendor
iTrader: (3)
 
Joined: Jun 2007
Posts: 2,991
Likes: 2
From: Virginia Beach,Virginia
Default
4'' downpipe is good for about 1500hp,anything more needs a 5''
Reply
0
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

 Pouria Savadkouei
story-1

Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

 Verdad Gallardo
story-2

7 Most Reliable High-Performance Engines GM Has Ever Built

 Verdad Gallardo
story-3

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

 Verdad Gallardo
story-4

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

 Pouria Savadkouei
story-5

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

 Verdad Gallardo
story-6

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-7

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-8

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-9

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

 Verdad Gallardo
Old Aug 13, 2008 | 07:06 PM
Share
  #9  
veee8's Avatar
veee8
8 Second Club
iTrader: (40)
 
Joined: Aug 2005
Posts: 1,861
Likes: 0
From: Raleigh,North Carolina
Default
I have a 5" with a PA k-member and Spohn solid mounts. Runs down the passenger side along block, dumps behind front tire.
Reply
0
Old Aug 13, 2008 | 08:37 PM
Share
  #10  
bumpin_records's Avatar
bumpin_records
Thread Starter
TECH Resident
iTrader: (19)
 
Joined: Jan 2004
Posts: 802
Likes: 2
From: chicago
Default
i have the Spohn k-member and solid mounts. it just look like its gonna be a little tight.
Reply
0
Old Aug 14, 2008 | 10:11 AM
Share
  #11  
Pro Stock John's Avatar
Pro Stock John
LS1Tech Co-Founder
20 Year Member
Community Influencer
iTrader: (34)
 
Joined: Nov 2001
Posts: 45,361
Likes: 1,792
From: Chicago, IL
Default
What's your goal? I'd say if it's mid to high 8's I would do a 4" DP seems like that works.
Reply
0
Old Aug 14, 2008 | 11:03 AM
Share
  #12  
veee8's Avatar
veee8
8 Second Club
iTrader: (40)
 
Joined: Aug 2005
Posts: 1,861
Likes: 0
From: Raleigh,North Carolina
Default
Originally Posted by bumpin_records
i have the Spohn k-member and solid mounts. it just look like its gonna be a little tight.
Oh it is tight, but does have plenty of clearance. We laid a section of 5" in there while we fabbed the headers. Thinking ahead on that one! But 5" parts are crazy expensive. Go find out how much mandrel bends and v-bands run!
Reply
0
Tags
Back to Subforum
Forced Induction
View Next Unread
First runs of the FI98X setup




Advanced Search

All times are GMT -5. The time now is 07:22 AM.

story-0
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

Slideshow: We take a close look at the ONE and Artidiag 800BT2 diagnostic tools from Topdon and the reasons to buy one over the other.

By Pouria Savadkouei | 2026-05-28 11:05:11


VIEW MORE
story-1
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.

By Verdad Gallardo | 2026-05-26 18:23:54


VIEW MORE
story-2
7 Most Reliable High-Performance Engines GM Has Ever Built

Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.

By Verdad Gallardo | 2026-05-21 16:45:27


VIEW MORE
story-3
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-4
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-5
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-6
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-7
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-8
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-9
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