Borla Atak NPP

BRM ZL1 · 07-03-2017, 08:03 AM

So I have a new Borla Atak Npp cat back installed with the new valves and the secondary cat delete. It sounds great with the valves open but it sounds like its rattling with the valves closed in stealth mode. Anyone else with this system can tell me if this sounds normal. Thanks
https://youtu.be/ZSyzW4e_cRc

mild2wild · 07-03-2017, 11:59 AM

It's hard to tell for sure without being there in person, but the sound reminds me of a friend's car that has a little rattling because of the headers and x-pipe on the car.

brantley847 · 07-03-2017, 12:14 PM

The moral of this story is to never, ever run in stealth mode.

Spartan268 · 07-03-2017, 12:48 PM

Quote:

Originally Posted by BRM ZL1

So I have a new Borla Atak Npp cat back installed with the new valves and the secondary cat delete. It sounds great with the valves open but it sounds like its rattling with the valves closed in stealth mode. Anyone else with this system can tell me if this sounds normal. Thanks
https://youtu.be/ZSyzW4e_cRc

This happens on the stock NPP exhaust as well. You can contact Borla directly and they'll take care of you. They have good customer service from what I've heard.

Drizzt ss · 07-03-2017, 01:12 PM

I had a borla exhaust on my sti before my camaro. One of the welds came off a bracket. Called up and they couldn't have been better customer service out there. I sent them a few pics of the problem with my reciept, and they sent me an ENTIRE exhaust system to replace it. They told me I could do whatever I wanted with the old one. A million mile warranty is the shit and they couldn't be more helpful. Call asap dude, they are awesome. I'd have the same exact setup as you if it wasn't an arm and a leg, but I'm saving up for it!

BRM ZL1 · 07-03-2017, 05:41 PM

Thanks I did contact them and they said it was normal. I guess I should always run in track mode lol.

MAGAUSA · 07-03-2017, 05:50 PM

Doesn't sound too bad. My stock one is rattling again under load, not as loud at idle as before, but I expect it to get worse.

When did you receive the exhaust (have they started shipping their "revised" valve systems)? I think they weee using the crappy OEM valves and that caused their (and everyone's) issue.

BRM ZL1 · 07-03-2017, 06:24 PM

Quote:

Originally Posted by MAGAUSA

Doesn't sound too bad. My stock one is rattling again under load, not as loud at idle as before, but I expect it to get worse.

When did you receive the exhaust (have they started shipping their "revised" valve systems)? I think they weee using the crappy OEM valves and that caused their (and everyone's) issue.

I just got it installed at the chevy show in Carlisle PA June 24. I did confirm with the Borla rep that this was the new system with the new valves design.

MAGAUSA · 07-03-2017, 07:29 PM

Good luck! If Borla solves this crappy valve issue, I'll buy their S exhaust!

Drizzt ss · 07-03-2017, 08:30 PM

Quote:

Originally Posted by BRM ZL1

Thanks I did contact them and they said it was normal. I guess I should always run in track mode lol.

Rattling isn't normal. I would call back and make a stink about it. Not only is it not normal, but they made a revised part to correct it. Making a part to correct something normal? Gl!

07-03-2017, 08:03 AM	#1
BRM ZL1 Drives: 2019 ZL1 1LE Join Date: Feb 2015 Location: MD Posts: 201	Borla Atak NPP So I have a new Borla Atak Npp cat back installed with the new valves and the secondary cat delete. It sounds great with the valves open but it sounds like its rattling with the valves closed in stealth mode. Anyone else with this system can tell me if this sounds normal. Thanks https://youtu.be/ZSyzW4e_cRc

07-03-2017, 12:14 PM	#3
brantley847 v It bites. Drives: 2011 IBM 2SS/RS Join Date: May 2008 Location: Orlando, FL Posts: 3,585	The moral of this story is to never, ever run in stealth mode. __________________ 2011 2SS/RS Performance: 439 RWHP: 226/236 Comp Cam, Kooks 1-7/8, CAInc, Borla S type, Vmax TB, Rx Catch Can, Trans cooler, SLP 160 termo, Melling high volume, Eibach Springs/Sways 1" drop, Whiteline complete bushing kit.

07-03-2017, 01:12 PM	#5
Drizzt ss Drives: 2017 NGM 1SS MRC NPP Join Date: Feb 2017 Location: Long Island Posts: 234	I had a borla exhaust on my sti before my camaro. One of the welds came off a bracket. Called up and they couldn't have been better customer service out there. I sent them a few pics of the problem with my reciept, and they sent me an ENTIRE exhaust system to replace it. They told me I could do whatever I wanted with the old one. A million mile warranty is the shit and they couldn't be more helpful. Call asap dude, they are awesome. I'd have the same exact setup as you if it wasn't an arm and a leg, but I'm saving up for it! __________________ Mamo PTB /Borla ATAK NPP /Carbon Fiber lip/ZL1 side skirts/ Black Bow ties/Husky Mats/ Mishimoto CC /BMR strut tower brace/ZL-1 License relocation/Rock guards

07-03-2017, 11:59 AM	#2
mild2wild Drives: 2017 1LE Join Date: Aug 2016 Location: NY Posts: 26	It's hard to tell for sure without being there in person, but the sound reminds me of a friend's car that has a little rattling because of the headers and x-pipe on the car.

07-03-2017, 05:41 PM	#6
BRM ZL1 Drives: 2019 ZL1 1LE Join Date: Feb 2015 Location: MD Posts: 201	Thanks I did contact them and they said it was normal. I guess I should always run in track mode lol.

07-03-2017, 05:50 PM	#7
MAGAUSA Drives: 2017 Hyper Blue 1LE Join Date: Dec 2016 Location: Tampa Posts: 579	Doesn't sound too bad. My stock one is rattling again under load, not as loud at idle as before, but I expect it to get worse. When did you receive the exhaust (have they started shipping their "revised" valve systems)? I think they weee using the crappy OEM valves and that caused their (and everyone's) issue.

07-03-2017, 07:29 PM	#9
MAGAUSA Drives: 2017 Hyper Blue 1LE Join Date: Dec 2016 Location: Tampa Posts: 579	Good luck! If Borla solves this crappy valve issue, I'll buy their S exhaust!

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