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What does the exhaust look like without NPP?

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  • What does the exhaust look like without NPP?

    Has there been any photos the C8 without NPP? On the C7 there was a jarring difference between the pipes with and without NPP.

    Thanks.

  • #2
    I could be wrong, but in a video there was a shot of what appeared to be an electronic control to change the sound only. The outward appearance looked to be the same on both cars. Perhaps someone with more insight will comment.

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    • #3
      I also believe they look the same
      '64 Silver Grey Coupe (custom paint)- still our favorite
      '13 White/Blue Diamond 427 60th roadster - favorite late model
      Several others including two C7's

      '20... Zeus Bronze Coupe, 2LT, GT2 seats, Natural two tone, Body color accents, Pewter wheels- 10/1/20😀 GAME CHANGER

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      • #4
        Semi-related. Turns out the NPP only adds 1.2 HP and 0.8 LB/FT of torque.

        https://www.sae.org/standards/conten...2cors/preview/

        https://www.sae.org/standards/conten...2corn/preview/
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        • #5
          Interesting. Wonder what the law is on advertising HP in excess of the SAE test results.
          Delivered 5/29!: Scarlet Fever 2021 2LT HTC, Red Mist Metallic Tintcoat, two-tone Naturalw/ suede inserts, Mag Ride, Performance Exhaust, MRR 755 Gunmetal wheels

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          • #6
            Citing SAE numbers is still voluntary so far as I know and misquoting the number is only an issue if they specifically state they are SAE certified numbers. That said, I believe SAE-J1349 (and the accompanying J2723) have a small fudge factor - 2 percent if I remember - since not every engine performs exactly the same. Given the LT2/NPP test was only 0.69-percent off, I suspect all is fine ... impressive in any case (although I wonder why GM did not try for an even 500hp just for bragging rights).

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            • #7
              Originally posted by 07MontyRed View Post
              Citing SAE numbers is still voluntary so far as I know and misquoting the number is only an issue if they specifically state they are SAE certified numbers. That said, I believe SAE-J1349 (and the accompanying J2723) have a small fudge factor - 2 percent if I remember - since not every engine performs exactly the same. Given the LT2/NPP test was only 0.69-percent off, I suspect all is fine ... impressive in any case (although I wonder why GM did not try for an even 500hp just for bragging rights).
              I think they wanna save the higher hp numbers to sell the z06. And maybe they truly did go for 500 and just couldn't quite get it.
              '03 4Runner V8 4x4
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              Corvette coming soon

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              • #8
                Originally posted by Swift93 View Post
                I could be wrong, but in a video there was a shot of what appeared to be an electronic control to change the sound only. The outward appearance looked to be the same on both cars. Perhaps someone with more insight will comment.
                Very interesting. Some people got NPP for the looks alone on the C7. If the standard exhaust sounds fairly good I could see a lot of people passing on NPP this time around.

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                • #9
                  Good point docprego, that there was an exhaust tip size difference for the C7. I had forgotten that. GM is also going to be very interested in the C8’s NPP take rate.
                  Z06 coming late this summer: Hypersonic Gray HTC, two tone blue interior, complete high wing/aero package. CCB’s, with every piece of visible carbon fiber available. Lifetime, annual contributors, and 24 year members of National Corvette Museum. Home is the beautiful Pacific Northwest.

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                  • #10
                    Originally posted by tbs156 View Post

                    I think they wanna save the higher hp numbers to sell the z06. And maybe they truly did go for 500 and just couldn't quite get it.
                    And/or as some have speculated (but I have not had time to verify), by keeping the HP number below 500 HP, that results in more than a little lower insurance premiums for a ME sports car.
                    Z06 coming late this summer: Hypersonic Gray HTC, two tone blue interior, complete high wing/aero package. CCB’s, with every piece of visible carbon fiber available. Lifetime, annual contributors, and 24 year members of National Corvette Museum. Home is the beautiful Pacific Northwest.

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                    • #11
                      I believe the pipes were actually the same on the C7, at 2.5”. But the tips were different, 4” versus 3”. (I could be wrong, both my C7s were NPP.) Unless you were on the ground staring up the pipe to see the butterfly valve, the only visible difference between NPP and non-NPP was the size of the exhaust tips. I’m not sure we’ve seen that sort of distinction on the C8 mules.

                      i would be shocked if many people bought the C7 NPP for looks. Or even for the extra 5HP. It was that exhaust roar that you get by bypassing the noise reduction muffler that most people wanted.
                      Last edited by CaryBob; 08-15-2019, 07:20 PM.
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                      • #12
                        I wish I knew what it sounded like without NPP. I’ve not heard one yet or been able to find a video

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                        • #13
                          Originally posted by CaryBob View Post
                          I believe the pipes were actually the same on the C7, at 2.5”. But the tips were different, 4” versus 3”. (I could be wrong, both my C7s were NPP.) Unless you were on the ground staring up the pipe to see the butterfly valve, the only visible difference between NPP and non-NPP was the size of the exhaust tips. I’m not sure we’ve seen that sort of distinction on the C8 mules.

                          i would be shocked if many people bought the C7 NPP for looks. Or even for the extra 5HP. It was that exhaust roar that you get by bypassing the noise reduction muffler that most people wanted.
                          Guess I used the wrong term, I was referring to the appearance of the tips as viewed from the rear. The tips without NPP were laughable.

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                          • #14
                            Originally posted by CaryBob View Post
                            I believe the pipes were actually the same on the C7, at 2.5”. But the tips were different, 4” versus 3”. (I could be wrong, both my C7s were NPP.) Unless you were on the ground staring up the pipe to see the butterfly valve, the only visible difference between NPP and non-NPP was the size of the exhaust tips. I’m not sure we’ve seen that sort of distinction on the C8 mules.

                            i would be shocked if many people bought the C7 NPP for looks. Or even for the extra 5HP. It was that exhaust roar that you get by bypassing the noise reduction muffler that most people wanted.
                            Extra 1 hp*
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                            • #15
                              Originally posted by CaryBob View Post
                              i would be shocked if many people bought the C7 NPP for looks. Or even for the extra 5HP. It was that exhaust roar that you get by bypassing the noise reduction muffler that most people wanted.
                              The sound was definitely the main reason for me, but the NPP exhaust tips DO look a lot better, too. I certainly wouldn't have paid $1100 for that, but it was a small factor.

                              The description of the NPP exhaust on the C7 build & price site specifically mentions the 4" exhaust tips, and the base exhaust says 3" tips. The description in the ordering guide for the C8 says "with stainless-steel tips" for both the standard and NPP exhaust. That makes me think they're the same.
                              Delivered 5/29!: Scarlet Fever 2021 2LT HTC, Red Mist Metallic Tintcoat, two-tone Naturalw/ suede inserts, Mag Ride, Performance Exhaust, MRR 755 Gunmetal wheels

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                              Never grow up - It's a trap.

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