Header question/Already have Flowmaster exhaust
Thread Starter
Drifting
Joined: Sep 2005
Posts: 1,575
Likes: 3
From: Lowell Arkansas
Header question/Already have Flowmaster exhaust
I have a basically stock 1988 corvette with flowmaster exhaust.
I read that headers add 15 hp.
I was wondering if it will add 15 hp on top of what my flowmaster exhaust has already added, or is that 15 hp a combonation of headers and aftermarket exhaust together?
Is it worth the extra time/money to have headers, over having flowmaster exhaust with stock exhaust manifolds?
I read that headers add 15 hp.
I was wondering if it will add 15 hp on top of what my flowmaster exhaust has already added, or is that 15 hp a combonation of headers and aftermarket exhaust together?
Is it worth the extra time/money to have headers, over having flowmaster exhaust with stock exhaust manifolds?
Team Owner
Joined: Sep 2001
Posts: 62,160
Likes: 1,733
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
15rwhp on a stock engine, so basically yes it will add 15 on top of what the Flows added, which was probably around 10hp.
I'd say its worth it, I was happy with mine.
I'd say its worth it, I was happy with mine.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
If you now have stock front Y & stock cat going to FL headers & hi-flow or no cat will likely add 25chp of so.
Our exhausts were soo restrictive that our C4 respond very well to full exhaust upgrades.
If you think you might do heads/cam/intake later, now is the time to seriously consider going to true duals, with dual hi-flow cast if needed.
Our exhausts were soo restrictive that our C4 respond very well to full exhaust upgrades.
If you think you might do heads/cam/intake later, now is the time to seriously consider going to true duals, with dual hi-flow cast if needed.
Thread Starter
Drifting
Joined: Sep 2005
Posts: 1,575
Likes: 3
From: Lowell Arkansas
If you now have stock front Y & stock cat going to FL headers & hi-flow or no cat will likely add 25chp of so.
Our exhausts were soo restrictive that our C4 respond very well to full exhaust upgrades.
If you think you might do heads/cam/intake later, now is the time to seriously consider going to true duals, with dual hi-flow cast if needed.
Our exhausts were soo restrictive that our C4 respond very well to full exhaust upgrades.
If you think you might do heads/cam/intake later, now is the time to seriously consider going to true duals, with dual hi-flow cast if needed.
That sounds good. Will it benifit me over the Flowmaster I already have?
The Flowmaster system I have goes from the exhaust manifold, to a y pipe, to a catalytic converter, back to 2 pipes whith mufflers on each side.
What system do I have? It was on my car when I bought it.
I never really knew what people ment when they said Cat Backs etc. What if High Flow Cast?
Thread Starter
Drifting
Joined: Sep 2005
Posts: 1,575
Likes: 3
From: Lowell Arkansas
Its not stock, its a Flowmaster exhaust system.
They were just installed before I bought the car. They are almost new because I have only put about 8,000 miles on the car in the last 2 years.
It sounds better than anything I have ever heard.
It's loud and everyone always tells me that my vette it the best sounding car they have ever heard.
Not a lot of corvettes around here, so I'm sure if they heard the pipes on the forum members cars they would like them too.
Last edited by 5speedC4; Feb 5, 2007 at 07:17 PM.
Le Mans Master
Joined: Jun 2006
Posts: 5,642
Likes: 5
From: One day you're a Comet...the next day you're dust... Arkansas
If you don't have precats someone has replaced the front Y-pipe at some point. If they also put in a high flow main cat then headers may not gain you as much, assuming your motor is stock. Sounds like the PO knew what they were doing.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Pro
Joined: Apr 2006
Posts: 552
Likes: 0
From: Marlboro NJ
It sounds better than anything I have ever heard.
It's loud and everyone always tells me that my vette it the best sounding car they have ever heard.
Not a lot of corvettes around here, so I'm sure if they heard the pipes on the forum members cars they would like them too.
It's loud and everyone always tells me that my vette it the best sounding car they have ever heard.
Not a lot of corvettes around here, so I'm sure if they heard the pipes on the forum members cars they would like them too.
As far as sound...It will def be louder and have a crisper sound after the longtubes. It will only make the car sound better. If you need to do the cats...Get a couple magnaflow high flow's. Then your good to go.
