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How much hp from LT headers?

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Old Jul 5, 2012 | 03:30 AM
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From: van nuys, ca
Car: 88 c4
Engine: 5.7 tpi
Transmission: auto
How much hp from LT headers?

Currently i just have an ebay CAI.

Looking to get a bit more hp out of the small 305 LB9...

How much would full exhaust including LT headers would net?


Is the HP gain worth the money?

Last edited by litemupp; Jul 5, 2012 at 03:35 AM.
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Old Jul 7, 2012 | 01:21 AM
  #2  
litemupp's Avatar
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From: van nuys, ca
Car: 88 c4
Engine: 5.7 tpi
Transmission: auto
Re: How much hp from LT headers?

dang fellas, no replies?
I suspect at least half of members on here are running some sort of aftermarket exhaust...
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Old Jul 7, 2012 | 11:42 AM
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LB9GTA's Avatar
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From: Manitoba
Car: '91 GTA
Engine: 421sbc
Transmission: Powerglide
Axle/Gears: Ford 9" with 3.89
Re: How much hp from LT headers?

if all you have for extra's on the car is a CAI, I would think about 10% hp gain.
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Old Jul 8, 2012 | 12:04 PM
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From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Re: How much hp from LT headers?

The ground clearance issues and installation hassles of long tubes wouldnt be worth it on a stock 305. Go with a good 3" cat-back for now, and if you really want headers, a set of shorties is fine for your power level.
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Old Jul 8, 2012 | 10:25 PM
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From: Desert
Car: 1991 Z28 Vert
Engine: 383 single plane efi
Transmission: T-56
Axle/Gears: 8.8 with 3.73s
Re: How much hp from LT headers?

Dyno Don's headers at top down solutions are a shorty header with a custom Y-pipe. You won't find a set up with better ground clearance. I believe they are 1.75 inch primary as well. Depending on your budget, the price may be steep. I have hooker long tubes, I am apprehensive about speed bumps.
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