[Gmanuel]

Originally Posted by Tr6

^ Correct.

Porting heads = tune needed. Tune = warranty issues, technically.

As for porting, you can only get away with 3 parts, without voiding your warranty due absalutely not needing a tune however, if you want to MAXIMIZE the gains, of course tune it. Which are:

Throttle Body
Intake Manifold
Headers.

We do NOT have an exhaust manifold, Tri-y headers ftw.

Pros?

- Much more efficient than stock
- No one will be able to tell it is ported unless they compare it to the stock non ported part thus eliminating the risk of warranty issues, unless the part itself caused the issue which is extremely unlikely if you go with a good porter.
- Power gains, minor.
- MUCH cheaper than anything you can buy. You can have those 3 parts I listed ported half the price of any long tube headers.

Cons?

- Intake manifold on our cars and C7s, no matter the porter, will whistle. Whistling decibel will only be lower if done by a good porter and higher with a bad job. I cannot hear mine unless I have windows down and slowly accelerate past 3k rpm. If I wide open throttle, my exhaust and engine noise masks the whistle.
- Car will have a few weeks of downtime due to you sending your stock parts in UNLESS you buy used or new parts to send to porting like I did. I bought a throttle body and an intake manifold with 100 miles off of a 2015 C7 Z51.
- Power gains, minor vs major power gains of using aftermarket parts (like MSD IM, ARH headers etc but those are $$$$$)
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Something to absolutely keep in mind about porting stuff... You aren't doing it to get 100 hp per mod. It is to increase the efficiency more so than gaining power and they work like lego blocks. Porting the TB alone won't really do much, it will help sure but when you couple it with the intake (pick your brand) - ported TB - ported IM - ported headers they all come alive TOGETHER. And 1 MAJOR advantage of porting the stock stuff... you save A LOT of money.

It is a pay what you get kind of deal... You get ARH long tubes instead of porting headers, you will gain a lot more power of the ARH LTs than porting but you also loose your warranty, loud noises etc... Pros and cons. Modding is a game that you pay to play.

I had read somewhere that porting our headers would not really be possible, for some reason. Have you ported yours yet, or seen any reason why it couldn't be done?