Is the NPP exhaust resonated?
Thread Starter
Racer
Joined: Oct 2016
Posts: 434
Likes: 27
Is the NPP exhaust resonated?
is the npp exhaust resonated? wondering if doing kooks headers and x pipe would increase volume and how it would sound retaining the npp mufflers.
also is the cat delete worth it on the lt1's? or should I go catted X?
also is the cat delete worth it on the lt1's? or should I go catted X?
Former Vendor
Joined: Sep 2016
Posts: 1,397
Likes: 267
From: Houston Texas
We run cars all the time with headers and x-pipe with the stock rear exhaust. Sounds great in my opinion. Very little chance of that resonator sound you get with aftermarket slip on exhaust.
If you can, leave the cats out. Power will show a much nicer increase.
If you can, leave the cats out. Power will show a much nicer increase.
Last edited by Billy@MTI; Oct 21, 2016 at 01:00 PM.
Team Owner
Joined: Jan 2007
Posts: 29,063
Likes: 1,839
From: cookeville tennessee
If you are looking for a much louder sound you need to cut out the mufflers all together and just have a pipe welded in it place. Then have a set of tips welded on that pipe. Yes I am still NPP with my Borla cat back set up but with all of the above IF I was looking at doing all of this JUST for the sound it was a waste of money if for that reason... Robert
Former Vendor
Joined: Sep 2016
Posts: 1,397
Likes: 267
From: Houston Texas
Team Owner
Joined: Jan 2007
Posts: 29,063
Likes: 1,839
From: cookeville tennessee
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Team Owner
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From: cookeville tennessee
Thread Starter
Racer
Joined: Oct 2016
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Team Owner
Joined: Mar 2005
Posts: 20,933
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From: salem OR
A nice set-up IMO Plus your dropping some weight off the front.
The stock manifold and cats are heavy and hold a ton of heat right under your hood.
Coated headers hold all most none compared.
The sound really is better, About the same volume but you get tuned sound. Sounds better open or closed. I don't want the smell you can get from no cats. The cats take away very little in power on the AHR their cats are very high flow. The kooks header and cats I had in the past didn't flow as well as the ARH set-up.
Power increase is eye opening with a professional tune.
I strongly recommend the Jethot coating. I tried a different brand of coating and it burned off after a year or two. Where I pulled my Kooks
off that were jethot coated after 2 years and they wiped clean with a rag like new. But it costs 450.00! But so worth it!
Then the cooling properties of the Jethot coating is obvious under your hood is cooler cools quicker and your temps run cooler as well.
A Homerun!
Last edited by 3 Z06ZR1; Oct 23, 2016 at 03:05 AM.
Melting Slicks
Joined: Aug 2014
Posts: 2,746
Likes: 916
Here's a video demo that I put together of my Kooks 1 7/8" long tube headers + Kooks green catted midpipe + stock NPP mufflers. I have not tuned the car yet and have absolutely no check engine light, if that matters to anyone. I absolutely love the sound. In the video, I have an external mic attached to just below the spoiler. Inside the car, it sounds pretty tame although you can hear it in the first scene...
Fast forward to 4:00 to hear what it sounds like when going near WOT in track mode...
Fast forward to 4:00 to hear what it sounds like when going near WOT in track mode...
Last edited by lakemg; Oct 27, 2016 at 10:10 PM.
