headers + NPP
Thread Starter
Racer
Joined: Mar 2012
Posts: 388
Likes: 0
From: NC
headers + NPP
i got my brand new cyber gray grand sport today with npp! when i do 1 3/4 headers w catless x pipe will it be insanely louder when in "wild" mode with the flaps open on the npp? im just not sure what kind of volume increase i should be expecting. if its still gonna be streetable or im gonna get pulled over cuz its that crazy. thanks for any help! im glad to be a vette owner!
Matt
Matt
Premium Supporting Vendor
Joined: Nov 2006
Posts: 30,317
Likes: 165
From: Reading PA
Yes, it is going to be considerably louder. I just did this with my Camaro, 1st in the world actually, to get it working. I used 1 7/8 ARH and the Camaro ZL1 dual mode exhaust and it is really loud when you get on it. While cruising it isn't too bad. Just WOT.
Thread Starter
Racer
Joined: Mar 2012
Posts: 388
Likes: 0
From: NC
i love the crazy amount of backfire/gurgle on decel with the npp open (i just removed the fuse immediately) im sure it will be even more pronounced when i do catless headers 
Drifting
Joined: Jun 2000
Posts: 1,872
Likes: 294
From: St. Louis MO
oh yeah! If I can help, let me know
Safety Car
Joined: Dec 2010
Posts: 4,150
Likes: 378
From: Detroit
Yes it will be louder but I will sound awesome. I have a switch on mine so I open them when I feel in that mood but for the most part I keep them closed. I have no issues with the law when I do have them open though. Here is a video of mine.
http://www.youtube.com/watch?v=2MPlN...e_gdata_player
http://www.youtube.com/watch?v=2MPlN...e_gdata_player
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Racer
Joined: Apr 2006
Posts: 495
Likes: 1
From: Valley Stream NY
Just my .02, but I wouldnt go with anything less than 1 7/8 tube on the LS3. I have them on my '11 GS A6. Nick from ARH recommended them strongly for the LS3. Give him a call and talk to him before you pull the trugger on a smaller diameter tube.
Thread Starter
Racer
Joined: Mar 2012
Posts: 388
Likes: 0
From: NC
i may have to check into it a bit more...i talked to the guys at LG motorsports and they said to definitely not go with 1 7/8 because it loses way too much tq compared to the 1 3/4. They said the LS3 doesnt quite flow enough air to justify the 1 7/8 headers....im confused now haha
Safety Car
Joined: Sep 2007
Posts: 4,359
Likes: 6
From: Los Alamitos California
St. Jude Donor '09
i may have to check into it a bit more...i talked to the guys at LG motorsports and they said to definitely not go with 1 7/8 because it loses way too much tq compared to the 1 3/4. They said the LS3 doesnt quite flow enough air to justify the 1 7/8 headers....im confused now haha
San
Thread Starter
Racer
Joined: Mar 2012
Posts: 388
Likes: 0
From: NC
Pro
Joined: Mar 2012
Posts: 708
Likes: 142
From: N.W. Georgia
Bigger is not always better. 1 7/8" may work better...on an LS7. Stick to your guns on this, because LG knows what they're talking about. And don't let anyone try to convince you to dump your perfectly-good exhaust, either. Also, you won't notice any power difference if you dump your cats so, unless you need to unleash as much stink and every db of noise possible, why do that? Just asking...
Thread Starter
Racer
Joined: Mar 2012
Posts: 388
Likes: 0
From: NC
Bigger is not always better. 1 7/8" may work better...on an LS7. Stick to your guns on this, because LG knows what they're talking about. And don't let anyone try to convince you to dump your perfectly-good exhaust, either. Also, you won't notice any power difference if you dump your cats so, unless you need to unleash as much stink and every db of noise possible, why do that? Just asking...
Safety Car
Joined: Sep 2006
Posts: 4,075
Likes: 6
From: Wilmington NC
My neighbors appreciate the NPP exhaust.
Burning Brakes
Joined: Jun 2000
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Race Director
Joined: Sep 2007
Posts: 16,557
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From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
i appreciate it! yea thats what i thought. for all my final questions i always call LG since they are always happy to answer my questions and i take their advice and do exactly as they say since they do so much development on these cars. they told me even if i do a cam down the road to stick with 1 3/4 headers. but thats wayyyyyy down the road for me. just sticking to bolt ons for now