NPP too quiet :( - Page 2 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Spurshot · 01-23-2018, 08:19 AM

Quote:

Originally Posted by Kopterman

When I lived in Cali the grace period with a new car was 7 years. Don’t know if it’s changed.

You’re right. Need a smog check at the beginning of the 7th year. So 6 years of operation from new.

I ran across a couple more regulations as well. Noise level is limited to 95 dB per SAE J1169 test.

Royal Tiger · 01-23-2018, 10:29 AM

Kalifornia:

The place that spends hundreds of thousands of taxpayer dollars to make sure you don’t put an aftermarket exhaust on your car, but lets undocumented terrorists walk in and gives them free medical care. And you wonder why the other 49 states hope you leave.

DSX_Camaro · 01-23-2018, 10:55 AM

The biggest thing is modifying the stock NPP will not make the car louder at all. If the fuse is pulled the mufflers are open. Changing to a different exhaust will make the car quieter. First thing is you need to get rid of the secondary cats and maybe swap to short headers if you aren't planning on moving any time soon, like the others have said. I don't know if changing the stock H to an X will make it any louder either.

sixty9fordkiller · 01-23-2018, 11:06 AM

if you live in california and want to stay smog legal and have a loud exhaust, just run straight pipes (with an xpipe) after the secondary cats.

or

just dont give a **** like me and run 1 7/8 headers, no cats, and 3" pipes with xpipe and keep the NPP mufflers (or your choice of mufflers) on and enjoy the song of our people!

01-23-2018, 10:55 AM	#17
DSX_Camaro Drives: 2013 SW 2LT/RS LFX/AY6 Join Date: Feb 2013 Location: Orlando, FL Posts: 1,741	The biggest thing is modifying the stock NPP will not make the car louder at all. If the fuse is pulled the mufflers are open. Changing to a different exhaust will make the car quieter. First thing is you need to get rid of the secondary cats and maybe swap to short headers if you aren't planning on moving any time soon, like the others have said. I don't know if changing the stock H to an X will make it any louder either. __________________ K&N CAI, 1LE Strut Tower Brace, Elite Engineering Catch Can and Clean Side Separator, Apex Scoop w/ Washer Relocation Kit, CTS Front Calipers and Rotors, JacFab Ported Intake Manifold, JacFab Intake Manifold Spacer, 80mm Overkill Throttle Body, SS Brake Lines, Ideal Garage Master Cylinder, Monster Twin Disc Clutch, NPP Retrofit w/ Magnaflow Resonated X, ARH Catless Downpipes, JRE Built 3.45 Diff, 1LE Axles, 1LE Hubs, Overkill Tuned, BMR Anti Wheel-hop Kit Stage I, ACS TL1 Hood Insert, ZL1 Spoiler

01-23-2018, 11:06 AM	#18
sixty9fordkiller Donkey Dick Cam Camaro Drives: 2010 2SS/RS LS3 M6 Join Date: Oct 2009 Location: Los Angeles, CA Posts: 2,000	if you live in california and want to stay smog legal and have a loud exhaust, just run straight pipes (with an xpipe) after the secondary cats. or just dont give a **** like me and run 1 7/8 headers, no cats, and 3" pipes with xpipe and keep the NPP mufflers (or your choice of mufflers) on and enjoy the song of our people! __________________ Bone Stock

01-23-2018, 10:29 AM	#16
Royal Tiger Account Suspended Drives: 2013 2SS/RS Convertible Join Date: Apr 2016 Location: Lehigh Valley, PA Posts: 3,873	Kalifornia: The place that spends hundreds of thousands of taxpayer dollars to make sure you don’t put an aftermarket exhaust on your car, but lets undocumented terrorists walk in and gives them free medical care. And you wonder why the other 49 states hope you leave.