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02-28-2017, 12:11 PM
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#1 |
 
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2nd Cat delete and Mid-pipe add to Dual Mode
Hi everyone - I am considering doing a 2nd cat delete and doing the mid-pipes on my 2017 2SS, with NPP dual mode exhaust.
Has anyone done this? Any advice would be appreciated. Any impact on warranty? Thanks! |
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02-28-2017, 01:07 PM
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#2 |
         
Drives: '17 2SS H50 Join Date: Mar 2016
Location: Louisa, Ky
Posts: 3,952
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I've done it, with the Borla S-Type, it's awesome. Did it in my garage on the floor.
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2017 H50-2SS-MN6-F55-NPP-RIK-WL4-IO6
1100 - 5/26 0000 - Cancelled - 7/5 Contacted Becky - 7/1 2000 - 7/5 3000 - 7/6 3000 - 7/11 TPW 8/1 3100 - 7/18 TPW 8/1 3300 - 7/20 3400 - 7/21 Built - 8/2 - PS 1,182/1 of 699US 4300 - 8/3 5000 - 8/5 6000 - 8/13 |
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02-28-2017, 01:32 PM
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#3 | |
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I've seen quite a few folks do this with the Borla system. I'd recommend Borla if you want a good sound and don't want to risk any drone. They have a few options for mid-pipes you can get them with the AFM valve or without and you can do the secondary cat delete or no delete so that the mid pipes run up to about 3-4" away from the secondary cat.
I wasn't sure what type of emissions issues a secondary cat delete may present (not sure why else GM put that there instead of a resonator) so I did the Borla mid-pipes without the secondary cat delete but with the AFM valves (part#60610) and I paired them with the Borla S-type axleback with NPP. Depending on what configuration you want here is the parts list and some sound clips of mine, if you go with the secondary cat delete it will just be slightly louder and slightly more raspy. Sound Clip 1 Sound Clip 2 Quote:
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02-28-2017, 01:46 PM
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#4 |
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Drives: '17 2SS H50 Join Date: Mar 2016
Location: Louisa, Ky
Posts: 3,952
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Gdgraph has a good clip, I watched his before my decision. I deleted my secondary cats. I have an M6, so there wasn't any need for the afm. I kept my NPP as well.
https://youtu.be/ENS1Q-3WGzk https://youtu.be/3a3KdEGnw6k Heath
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2017 H50-2SS-MN6-F55-NPP-RIK-WL4-IO6
1100 - 5/26 0000 - Cancelled - 7/5 Contacted Becky - 7/1 2000 - 7/5 3000 - 7/6 3000 - 7/11 TPW 8/1 3100 - 7/18 TPW 8/1 3300 - 7/20 3400 - 7/21 Built - 8/2 - PS 1,182/1 of 699US 4300 - 8/3 5000 - 8/5 6000 - 8/13 |
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02-28-2017, 01:55 PM
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#5 | |
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I would say my cold start sounds about the same, but that second post outside sounds really good! It has a much throatier sound w/ the secondary cat delete, I like it!
I'd consider doing the secondary cat delete if I wasn't already planning to eventually do headers, since I'm not sure which ones I'll get (green cats or no cats). Quote:
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02-28-2017, 02:25 PM
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#6 | |
Drives: SS-6-SPD Join Date: Jan 2017
Location: New Jersey
Posts: 1,364
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i have done it! it's great!!
here's a video ... cold start with valve closed.. cold start valve open https://www.instagram.com/p/BQteJ8sj...=cmejatt&hl=en |
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02-28-2017, 02:41 PM
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#7 |
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Thanks everyone. I am trying to decide between doing cat delete and x pipe, or cat delete and doing the mid pipes... Seems like its about 50 / 50...
cmeJATT - did you do Borla mid pipes, or built by the muffler shop? |
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02-28-2017, 02:58 PM
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#8 | |
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Drives: SS-6-SPD Join Date: Jan 2017
Location: New Jersey
Posts: 1,364
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i did a cheap man exhaust...
bought a flowmaster Xpipe for $240... had the muffler shop extend that pipe up to delete the secondary cat... cost me $150 to install xpipe and extend the pipe... total i spent was $390 ... it was on sale when i bought it lol.. idk look around to see if you can find it for $240 .. i got it on Black Friday. http://www.ebay.com/itm/Flowmaster-E...tYWVAi&vxp=mtr If you go Borla it's going to cost you $600-ish plus install... Quote:
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02-28-2017, 03:34 PM
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#9 |
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Snackbar Tuning
Drives: 2023 SGM ZL1 Join Date: Oct 2016
Location: Florida
Posts: 1,104
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Borla is $$$, but you dont have to chop up the factory exhaust at all. That is one of the big reasons I chose Borla. Plus it sounds amazing.
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02-28-2017, 03:38 PM
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#10 | |
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Drives: '17 2SS H50 Join Date: Mar 2016
Location: Louisa, Ky
Posts: 3,952
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Quote:
Heath
__________________
2017 H50-2SS-MN6-F55-NPP-RIK-WL4-IO6
1100 - 5/26 0000 - Cancelled - 7/5 Contacted Becky - 7/1 2000 - 7/5 3000 - 7/6 3000 - 7/11 TPW 8/1 3100 - 7/18 TPW 8/1 3300 - 7/20 3400 - 7/21 Built - 8/2 - PS 1,182/1 of 699US 4300 - 8/3 5000 - 8/5 6000 - 8/13 |
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02-28-2017, 04:09 PM
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#11 |
 
Drives: 16 Summit white, Ceramic white 2SS Join Date: Jan 2016
Location: Places
Posts: 419
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Wtf was my comment deleted??
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02-28-2017, 04:10 PM
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#12 | |
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Exactly, the fitment will be perfect if you get the Borla mid-pipes, whether you decided to get their mid-pipes with or without the secondary cat delete. Took me less than an hour to do mine.
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02-28-2017, 06:03 PM
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#13 | |
 
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I deleted my 2nd cats too.. Did the X pipe do anything for sound?? |
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03-01-2017, 09:00 AM
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#14 | |
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Drives: SS-6-SPD Join Date: Jan 2017
Location: New Jersey
Posts: 1,364
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i did both at the same time so idk if xpipe really affected the sound... justget the pipe that deletes the crush section on the back...
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| Tags |
| cat, cat delete, exhaust, mid pipe, muffler |
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