70 Exhaust decision. Original 2" style or N11

[Bill L.]

Well the local muffler shop ruined my exhaust so now I am in the market for a replacement.

Consensus seems to be Corvette Central.

The CC N11 is available for a 70 and goes from 2" to 2-1/2". The N11 muffler is as close to original without being so.

The 2" exhaust system has mufflers that are not crimped like the originals but is the right size throughout.

Will there be any points difference between the N11 and 2" exhaust system.

I understand that the N11 was not available in 70 but that the muffler was indistinguishable from the original from an outward apperance.

Mine is an L46 if that matters.

Thoughts?


Kind Regards,


Bill

[Edward J.]

Re: 70 Exhaust decision. Original 2" style or N11

Bill my 63 I installed a C.C. central N-11 system and sounds great,its just a little better exhaust note to me. I think no matter where you go for the system its a deduction on the judging floor. Corvette Central makes a great quality system and is built to last.

[Mark E.]

Re: 70 Exhaust decision. Original 2" style or N11

Your L46 had a 2" exhaust, so installing 2 1/2" will be a configuration deduction. This would be up to 20% deduction for originality on that line item, probably less than that.

N11 may be indistinguishable from the standard 2 1/2" muffler; I believe the only difference is internal.

[Bill L.]

Re: 70 Exhaust decision. Original 2" style or N11

Bill my 63 I installed a C.C. central N-11 system and sounds great,its just a little better exhaust note to me. I think no matter where you go for the system its a deduction on the judging floor. Corvette Central makes a great quality system and is built to last.

Thank you Edward.

Kind Regards,

Bill

[Bill L.]

Re: 70 Exhaust decision. Original 2" style or N11

Your L46 had a 2" exhaust, so installing 2 1/2" will be a configuration deduction. This would be up to 20% deduction for originality on that line item, probably less than that.

N11 may be indistinguishable from the standard 2 1/2" muffler; I believe the only difference is internal.

I understand 2" is correct. What I am wondering is if after losing points on originality, might I gain some back as a result of the muffler being a bit more correct with the N11.

I really wish CC would offer the N11 type muffler with a 2" inlet and outlet to match an original 2" system. I cannot imagine it would cost much to do since they already have the N11 muffler and a 2" type muffler with 2" inlet and outlet. Hope I just made sense.

Unfortunately exhaust seems to be one of those areas where getting points is really tough with anything but an original system.


Kind Regards,


Bill

[Paul O.]

Re: 70 Exhaust decision. Original 2" style or N11

Bill

If you install a 2 1/2" system on a car originally equipped with a 2" system. The deduction should be 40% for Configuration and Date and another 20% on finish if there is an issue with it. Also if the pipes are not welded but clamped at the mufflers that is a installation issue. One has to remember pipes and heat riser are on one line, mufflers on another, then clamps and hangers and tips are the final line. I have yet to see a aftermarket replacement muffler or pipes that is configured as an original.

[Patrick H.]

Re: 70 Exhaust decision. Original 2" style or N11

If you install an aluminized system, standard deduction is 25%, so that's what the penalty will be.
However, as Paul notes, swap a 2 1/2 inch system - aluminized or not - in place of a 2 inch, and you will get more deductions.

[Edward J.]

Re: 70 Exhaust decision. Original 2" style or N11

Bill, I would do as you like and want since the as Paul has explained the judging of these systems, no matter how you look at it there is a configuration problem, so if its the pipes the mufflers the bends, it still 20%, then brings in the date, and finishes. all C3 judges are on the same page with exhaust systems.

[Mike F.]

Re: 70 Exhaust decision. Original 2" style or N11

My 70 L-46 with 2 1/2" & N11's (not CC) lost 10pts at San Antonio. The better flowing exhaust and sound is worth the 10pts to me.

Unless the exhaust is 100% original, you're going to lose points. Might as well pick the exhaust that you like and helps the car breath better.

[Bill L.]

Re: 70 Exhaust decision. Original 2" style or N11

If you install an aluminized system, standard deduction is 25%, so that's what the penalty will be.
However, as Paul notes, swap a 2 1/2 inch system - aluminized or not - in place of a 2 inch, and you will get more deductions.

Thank you Patrick.

[Bill L.]

Re: 70 Exhaust decision. Original 2" style or N11

Bill

If you install a 2 1/2" system on a car originally equipped with a 2" system. The deduction should be 40% for Configuration and Date and another 20% on finish if there is an issue with it. Also if the pipes are not welded but clamped at the mufflers that is a installation issue. One has to remember pipes and heat riser are on one line, mufflers on another, then clamps and hangers and tips are the final line. I have yet to see a aftermarket replacement muffler or pipes that is configured as an original.

Thank you Paul.

[Bill L.]

Re: 70 Exhaust decision. Original 2" style or N11

Bill, I would do as you like and want since the as Paul has explained the judging of these systems, no matter how you look at it there is a configuration problem, so if its the pipes the mufflers the bends, it still 20%, then brings in the date, and finishes. all C3 judges are on the same page with exhaust systems.

Thank you Edward.

[Bill L.]

Re: 70 Exhaust decision. Original 2" style or N11

My 70 L-46 with 2 1/2" & N11's (not CC) lost 10pts at San Antonio. The better flowing exhaust and sound is worth the 10pts to me.

Unless the exhaust is 100% original, you're going to lose points. Might as well pick the exhaust that you like and helps the car breath better.

Hi Mike,

Well you just convinced me.

Thank you,


Bill

[Joe L.]

Re: 70 Exhaust decision. Original 2" style or N11

Well the local muffler shop ruined my exhaust so now I am in the market for a replacement.

Consensus seems to be Corvette Central.

The CC N11 is available for a 70 and goes from 2" to 2-1/2". The N11 muffler is as close to original without being so.

The 2" exhaust system has mufflers that are not crimped like the originals but is the right size throughout.

Will there be any points difference between the N11 and 2" exhaust system.

I understand that the N11 was not available in 70 but that the muffler was indistinguishable from the original from an outward apperance.

Mine is an L46 if that matters.

Thoughts?


Kind Regards,


Bill

Bill------


In my opinion, there's no exhaust sound better than the 63-72 standard (i.e NON-N-11) exhaust. It's plenty loud enough and has a dulcet, sophisticated, uniquely Corvette sound. The louder N-11 exhaust sacrifices some of the dulcet tone for loudness----not a good trade-off in my mind.

[Mark E.]

Re: 70 Exhaust decision. Original 2" style or N11

Bill------


In my opinion, there's no exhaust sound better than the 63-72 standard (i.e NON-N-11) exhaust. It's plenty loud enough and has a dulcet, sophisticated, uniquely Corvette sound. The louder N-11 exhaust sacrifices some of the dulcet tone for loudness----not a good trade-off in my mind.

I'm with Joe. I always thought the stock exhaust note on Corvettes was just right. Louder is just harsher.

Then again, Duntov once said in a magazine road test of a 454 car that the stock mufflers cost 20hp.

Now I need to look up "dulcet".