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12-17-2023, 11:05 AM
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#1 |
  
Drives: 2018 Camaro SS 1LE Join Date: Jul 2018
Location: Stuttgart, Germany
Posts: 903
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Extrude Hone OEM Manifolds
Anyone try extrude honing the OEM exhaust manifolds?
I'd like to stay with the OEM setup due to visual/emission restrictions and realize the manifolds and likely more so, the inlets to the cats are my next limiting factor. Amazing the engine makes 650 HP thru that tiny openning especially on the driverside... Extrude honing used to be advertised a good bit, but don't hear about it much now. I realize a set of tubular headers is the optimum answer... Thanks.
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12-17-2023, 11:14 AM
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#2 |
       Drives: 2024 CT5-V Blackwing Join Date: Sep 2020
Location: GA
Posts: 3,557
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No one uses this anymore. I think it would be a waste of money on exhaust manifolds.
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12-17-2023, 02:33 PM
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#3 | |
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Moderator
Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018
Location: New Ipswich NH
Posts: 6,350
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Quote:
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2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, ATI 8L90, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors & BB HPFP, TooHighPSI/Katech port injection, 15” conversion 1066 WHP STD/1027 SAE, 9.10@152.5 (new times coming)
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12-17-2023, 03:51 PM
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#4 |
Drives: 2021 1SS 1LE Join Date: Nov 2020
Location: 98548
Posts: 637
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SPD makes them for the Coyote F150 and they are pretty darn good. Quite a few people got fed up with false knock codes and these offer performance very close to headers, while maintaining OEM type fitment.
Dyno test on Whipple F150 - https://youtu.be/QywHE9T0DW0?si=NtpAOz-vrDUHxtzE
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Follow my build - https://www.camaro6.com/forums/showthread.php?t=594295
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01-18-2024, 01:54 PM
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#5 |
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Drives: 2018 Camaro SS 1LE Join Date: Jul 2018
Location: Stuttgart, Germany
Posts: 903
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Appreciate the replies. I came across a hand porting service:
https://socalporting.com/ They do Camaro manifolds as well...$400 which seems reasonable for the hand porting it requires. I do agree the cat entry's appear to be a significant choke point which this doesn't address.
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01-18-2024, 02:57 PM
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#6 |
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Petro-sexual
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These are mostly tubular, except the flanges, so there isn't much to extrude. I'd listen to Josh' and check out that post from swisstyphoon. If I recall - he ported the cat' flanges, mounted the manifolds to fixtures, and replaced the squashed pipes with larger-round pipes. I'll be looking into this some day, too.
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