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Old 06-24-2013, 11:29 PM   #1
trw427ss @ Futral

 
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Thumbs up L99 Exhaust Versus ZL1 NPP Exhaust with LT's

I swapped the factory L99 exhaust out for a factory ZL1 NPP exhaust on my car. Dynoed before and after a couple of hours apart. The factory L99 exhaust is not to bad, the ZL1 NPP exhaust made 4rwtq and 2rwhp at peak and 4-5rwhp through the middle over the L99 Exhaust! It has a deeper tone at idle than the L99 and is not as raspy at wide open throttle. Also I have 1 7/8's Stainless Power headers and no cats with both combo's.
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2013 2SS/RS L99/A6 Crystal Red Metallic Tincoat 12.76@108.98mph Bone Stock
12.46@111.19mph with New Era CAI & U/D Pulley
12.12 @ 114.16 after Stainless Power headers and no tune yet on stock P-Zero's!
12.007@ 115.20 With 18" Drag Radials - 11.93 @115.19 Added a PTB 11.76 @116.59 With Yank SS3200 Converter - 11.63 @116.52 After PI and Tuning 11.44 @118.75 New Best
10.72 @127.93 after heads and Cam and Yank SS3600
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Old 06-24-2013, 11:37 PM   #2
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You got it from GMPP?
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Old 06-24-2013, 11:38 PM   #3
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You got it from GMPP?
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Old 06-24-2013, 11:40 PM   #4
trw427ss @ Futral

 
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Quote:
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You got it from GMPP?
No, got it off a ZL1.
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2013 2SS/RS L99/A6 Crystal Red Metallic Tincoat 12.76@108.98mph Bone Stock
12.46@111.19mph with New Era CAI & U/D Pulley
12.12 @ 114.16 after Stainless Power headers and no tune yet on stock P-Zero's!
12.007@ 115.20 With 18" Drag Radials - 11.93 @115.19 Added a PTB 11.76 @116.59 With Yank SS3200 Converter - 11.63 @116.52 After PI and Tuning 11.44 @118.75 New Best
10.72 @127.93 after heads and Cam and Yank SS3600
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Old 06-24-2013, 11:43 PM   #5
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I was thinking of getting this exhaust. suggestion?
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Old 06-24-2013, 11:54 PM   #6
trw427ss @ Futral

 
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I was thinking of getting this exhaust. suggestion?
I like it and I can run it open or closed with the flip of a switch!
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2013 2SS/RS L99/A6 Crystal Red Metallic Tincoat 12.76@108.98mph Bone Stock
12.46@111.19mph with New Era CAI & U/D Pulley
12.12 @ 114.16 after Stainless Power headers and no tune yet on stock P-Zero's!
12.007@ 115.20 With 18" Drag Radials - 11.93 @115.19 Added a PTB 11.76 @116.59 With Yank SS3200 Converter - 11.63 @116.52 After PI and Tuning 11.44 @118.75 New Best
10.72 @127.93 after heads and Cam and Yank SS3600
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Old 06-25-2013, 12:04 AM   #7
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cut outs too?
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Old 06-25-2013, 12:12 AM   #8
trw427ss @ Futral

 
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cut outs too?
NPP exhaust has a vacuum control cut out built into the muffler ( duel mode exhaust). ZL1's and 1LE cars have this.
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2013 2SS/RS L99/A6 Crystal Red Metallic Tincoat 12.76@108.98mph Bone Stock
12.46@111.19mph with New Era CAI & U/D Pulley
12.12 @ 114.16 after Stainless Power headers and no tune yet on stock P-Zero's!
12.007@ 115.20 With 18" Drag Radials - 11.93 @115.19 Added a PTB 11.76 @116.59 With Yank SS3200 Converter - 11.63 @116.52 After PI and Tuning 11.44 @118.75 New Best
10.72 @127.93 after heads and Cam and Yank SS3600
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Old 06-25-2013, 07:33 AM   #9
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This exhaust is an option one all manual SS's starting with 2013 models.
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Old 06-25-2013, 10:01 AM   #10
trw427ss @ Futral

 
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Quote:
Originally Posted by ST1LE View Post
This exhaust is an option one all manual SS's starting with 2013 models.
And standard on 2012 and up ZL1's.
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2013 2SS/RS L99/A6 Crystal Red Metallic Tincoat 12.76@108.98mph Bone Stock
12.46@111.19mph with New Era CAI & U/D Pulley
12.12 @ 114.16 after Stainless Power headers and no tune yet on stock P-Zero's!
12.007@ 115.20 With 18" Drag Radials - 11.93 @115.19 Added a PTB 11.76 @116.59 With Yank SS3200 Converter - 11.63 @116.52 After PI and Tuning 11.44 @118.75 New Best
10.72 @127.93 after heads and Cam and Yank SS3600
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Old 06-25-2013, 10:13 AM   #11
DuskSS
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yup love mine will never change it out.
sounds and performs flat NASTY with LTs and a cam. and M2W rocks.
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Old 06-25-2013, 10:28 AM   #12
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Are they 2.5" or full 3" ?
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Old 06-25-2013, 03:32 PM   #13
trw427ss @ Futral

 
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Quote:
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Are they 2.5" or full 3" ?
They are all 2.5" (ZL1 and 1LE).
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2013 2SS/RS L99/A6 Crystal Red Metallic Tincoat 12.76@108.98mph Bone Stock
12.46@111.19mph with New Era CAI & U/D Pulley
12.12 @ 114.16 after Stainless Power headers and no tune yet on stock P-Zero's!
12.007@ 115.20 With 18" Drag Radials - 11.93 @115.19 Added a PTB 11.76 @116.59 With Yank SS3200 Converter - 11.63 @116.52 After PI and Tuning 11.44 @118.75 New Best
10.72 @127.93 after heads and Cam and Yank SS3600
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Old 06-26-2013, 04:06 PM   #14
trw427ss @ Futral

 
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Well so much for the 6rwhp everyone claims that NPP exhaust is worth! But it was worth it for the sound!
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2013 2SS/RS L99/A6 Crystal Red Metallic Tincoat 12.76@108.98mph Bone Stock
12.46@111.19mph with New Era CAI & U/D Pulley
12.12 @ 114.16 after Stainless Power headers and no tune yet on stock P-Zero's!
12.007@ 115.20 With 18" Drag Radials - 11.93 @115.19 Added a PTB 11.76 @116.59 With Yank SS3200 Converter - 11.63 @116.52 After PI and Tuning 11.44 @118.75 New Best
10.72 @127.93 after heads and Cam and Yank SS3600
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