Kooks Headers, Which X-Pipe with NPP?
Thread Starter
Advanced
Joined: Aug 2005
Posts: 78
Likes: 2
From: Georgetown IL
Kooks Headers, Which X-Pipe with NPP?
Hey guys,
I am thinking of purchasing exhaust, and I do like the dual mode function. I am looking at getting some Kooks Headers, but not sure of which X-Pipe to get with them. Secondly for those that have their setup with NPP, what're your real world opinions and feedback of this setup with the NPP exhaust?
I am thinking of purchasing exhaust, and I do like the dual mode function. I am looking at getting some Kooks Headers, but not sure of which X-Pipe to get with them. Secondly for those that have their setup with NPP, what're your real world opinions and feedback of this setup with the NPP exhaust?
Thread Starter
Advanced
Joined: Aug 2005
Posts: 78
Likes: 2
From: Georgetown IL
I'll certainly go elsewhere, for the lack of factual reply 
CLEARLY I was already going with Kooks, I was asking which X PIPE
and why for those who have owned either with the NPP
CLEARLY I was already going with Kooks, I was asking which X PIPE
and why for those who have owned either with the NPPLast edited by DARKNHT; Feb 14, 2019 at 07:39 PM.
Instructor
Joined: Mar 2014
Posts: 145
Likes: 23
i have 1 7/8 primary tube headers with the catted x pipe, by kooks, on my 09 Z, it bolts to the stock exhaust, has no effect on npp, is a little louder, noticeable but not bad. I used the catted pipe to eliminate exhaust smell and lower emissions on a 10 sec street car cant be a bad thing.
Melting Slicks
Joined: Feb 2017
Posts: 3,291
Likes: 1,283
From: Phoenix, AZ to Quakertown, PA.
C6 of Year Finalist (appearance mods) 2019
Running 1 7/8 long tubes with 3 inch catless x Pipe to my npp, very loud with npp open and yes it will drone at certain steady rpm's. Closed npp not so bad until you stomp on skinny pedal.....
Le Mans Master
Joined: Dec 2005
Posts: 6,999
Likes: 1,685
From: Southeast TX
You have two X pipe choices. Catted or off road (no cats). Just need to know the year model. And yeah, there're loud as all hell with the NPP's open and almost stock like quiet with them closed. I ran mine with no cats. Add cats and they will be a little quieter.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
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
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
Advanced
Joined: Sep 2017
Posts: 72
Likes: 15
From: Colorado
I'm running the 1 7/8 kooks with their catless x pipe into my factory npp. I love it. It's the perfect combination. Open and on the throttle it's definitely loud but cruising its fine and you always have the option of making it quieter by closing the exhaust.