PortlandxC7

there are several muffler shops that are excellent in what they do, you just have to find the right one

C8Jake

4 more clips for reference...this is what a C7 should sound like
note: this shop charges an incredibly ridiculous price & uses 4" tips...instead of 4.5's

dmvette

Thanks C7Jake. It does sound good with the muffler delete.

C8Jake

exhaust mod takes 2 hrs...fascia stays on.
Project cost less than $500 including sound insulation/CORSA tips...sold stock tips for $80.

C6 MoneyPit

After having my car for close to a year now, I can say that in hindsight I would have skipped the NPP exhaust and gone aftermarket or done this muffler delete. I know a lot of people love the NPP but I think it's too tame. For the price I could have done B&B Bullets (to be able to put it back to stock when sold) or this.

Jack Be Quick Racing

Yes, NPP, NAV, and PDR were three things I really wanted and I am okay that I have them but I don't feel I got the value I needed from them either.

PortlandxC7

I agree, I love my PDR/Nav though. However NPP is a waste..honestly. Good thing is when i sell the car I can weld npp back on and might sell this muffler delete kit!

KratosBear

What about drone? Is it bad? Also, did you consider leaving the npp and installing borla or corsa x pipe instead? Npp is good for resale but I like the sound of the muffler delete.

cheapthrills

I'm just going for a set of whistle tips and calling it a day.

PortlandxC7

Drone isn't bad at all, wrap with the sound insulation like Jake showed in his posts. My boss 302 had muffler delete too, so it is not like I can't stand any bit of drone. At the end of the day it depends on you but as far as my personal experience, no drone is not bad at all. As for the NPP, no i didnt want to leave the NPP as the sound was below my expectations, the only way was to get rid of it. Yes NPP is better for resale that is why I'm planning to weld it back on once i decide to sell it. Although from what i expect, the new buyer will love the sound and wont want the NPPs back if i were to ever sell it hehe

sxeC7

Or why doesn't someone make a cut-out kit that installs ahead of the NPP mufflers and uses NPP valve actuators to control the cut-out's valves so you still have the mild/wild option?

Has anyone heard anything about modifying the NPP mufflers similar to what was done with the C5 ZO6 titanium mufflers to get more sound?

97C5driver

And will the car pass CA smog if mufflers are deleted?

KratosBear

So... With the muffler delete and if u replace the x pipe with borla or corsa x pipe... Do you think the sound would be a 10 at that point? Or too loud?

sTz

C8Jake

sound insulation = quieter/tighter interior, less resonance/road noise, improved stereo sound

op z

I don't understand why you would remove the muffler AND install insulation? Drone? Do you just want it loud for those outside the car?

97C5driver

...

PortlandxC7

Not sure what you are not understanding exactly. Why would i remove mufflers? To make it aggressive obviously.. Why install insulation, to quiet down the cabin a little especially for those who cant handle drone and outside noise. The insulation tones it down, you will still hear the aggressive sound, but it won't necessarily give you a headache, or bee "too much" for those sensitive people.

And i don't "just want it loud" , it already is loud.. and I def. don't want it loud for "those outside the car either". I simply made it sound mean, and I love it, gives me a giggle every time i step on it a little, and when idling sound a million times better as well.

It is simple... if you like it DO IT! if not, DON'T
to each his own buddy

SharkAttack15

how loud is it in cockpit lol??

Bui

Doesn't Muffler delete cause drone?

Also, does anyone know if it affects emission test?