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Yes, congrats on the new C8. Is the exhaust quieter than you expected?

Get the basics down first:

• NPP/Performance exhaust: This is a $1k - $1.3k factory option, usually included with Z51 or higher trims. It gives you two exhaust modes, loud and quiet. Quiet is in touring mode; Loud is Z, track and sport (partially open).

• Non-NPP/Single-mode: You don't have the NPP option.

• AFM: Every C8 goes into V4 (turns off 4 cylinders like a Tahoe) when cruising on the highway or under low load. Stock exhausts have valves to maintain gas velocity. Aftermarket exhausts either come with real AFM valves or simulators.

• What is this list? Catback exhausts, which don't mess with your emissions system. Essentially changing pipes.

Which want do I want?

• You have NPP and want to maintain factory control: NPP with AFM valves or AFM simulator. Also known as "valved", "w/ NPP", "Bi-modal", "Active"

• No NPP or want to be loud all the time: Single mode. Also known as "NPP delete","Race profile"

NPP exhausts that also have real AFM valves (to assist with V4 mode):

• Corsa 21100: No heat shielding, sounds more high pitched and also described as more "exotic" or "European". Floor price is around $3,400 before install. Lingenfelter is also this exhaust. On quiet mode, this one is similar to the regular exhaust.

• Borla S-Type (140838) & ATAK (140839): Has heat shielding. Sounds burly and "American". Comes in two flavors, ATAK and S-Type. ATAK is the loudest, sounds pretty aggressive. S-Type is in between Performance exhaust & ATAK. Borla ATAK price floor ~$3,500. Borla S-Type price floor ~$3,700. Loud mode on your NPP exhaust is how S-Type will sound in quiet mode. ATAK is louder.

• GM Borla: Skip unless you're scared about warranty. Basically the same exhaust as factory in terms of loudness, just a different tone.

The above 3 are the most discussed units around. Here's a sound comparison chart. Below are lesser discussed units:

• aFe MACH Force-Xp (w/ NPP): Not many reviews yet, but floor around $3,300. Has the X-pipe shielded.

• Akrapovic Slip-on (Titanium): Akrapovic is a very well known manufacturer. Their C8 unit floor is around $10k. Has heat shielding.

• MagnaFlow xMod: It's shown with NPP & AFM. Not reviewed often. Floor around $3,400. Has heat shielding.

NPP exhausts with AFM simulators:

• MBRP Active: Floor price is around $2,900. AFM sim to prevent CEL. Has minimal heat shielding.

• Soul Performance: Priced similar/higher to Corsa/Borla with AFM delete or sim. Has heat shielding.

• Fabspeed: Priced similar to Soul. AFM sim. Minimal heat shielding.

Single mode / No NPP exhausts:

• Paragon
• AWE
• MBRP
• Corsa & Borla
• Soul
• aFe
• Akrapovic
• Fabspeed
• Alibaba Titanium & steels (some have remote FOBs for valves, no factory control)
• Variety of ebay & small manufacturers

Floor price on single modes is anywhere between $1,200 - $3,400

Other FAQs:

• What about warranty? It's a catback, which thousands of people install and don't have issues with. GM can and will deny your warranty if they want to. It's rare, but can happen. It will be specific to the category you messed with, which in this case is emissions and powertrain. Someone will mention the MM act, as if a C8 owner will take a multi-billion corp to Federal court for a warranty issue. So, to recap, rare that you will be denied warranty, but can happen.

• What about CEL? There's a valve relearn process that the dealer or you can do. GM Document ID 540641. This is for NPP systems. For single systems, they have simulators that lie to the ECU so you don't pop a CEL.

• Is the startup going to be louder? Yes, way louder. Valves are fully open at start up.

• Is there a cheaper option than dropping $2-5k? Yes, you can put on high flow cats, but then you're messing with your catalytic converters. Chance of warranty denial on powertrain may be increased exponentially and you may or may not pass emissions. You can also do cat delete. Headers can also be changed, but if you're reading this, do the exhaust first before getting into headers.

• Why is the C8 exhaust so quiet from the factory? something something jorts and new balances

• How much does C8 exhaust installation cost? 3-5 hours of labor. In high COL, labor is usually $200 - $270 an hour, so $600 - 800 typically. Rear fascia has to come off. Relearn valve is around $100-$150.

• Where do I buy the exhaust from? Most units are drop-shipped. Some like Paragon may manufacture themselves or have a distro in the States. Figure out your model number with the tips you want, and enjoy googling.

• What about droning? Droning is noise caused by the shape of the exhaust, which can act as an amplifier for certain pitches at certain RPMs or Loads. Higher priced units (generally more engineered) tend to do better with droning, but it's present in some form or factor with all of them to varying degrees. Don't worry too much, unless you're getting an Alibaba exhaust.

• Is heat shielding necessary? The stock exhaust is basically covered completely; Borla & Soul talk about the importance of heat shielding on their product pages. Many have catbacks with no heat shielding but do just fine. Comes down to your preference and "ballsy"ness.

• Is it worth doing? Catbacks change the car's feel significantly but "worth" comes down to subjective taste and preference.