My answer would be, are you feeling lucky? Re-read posts 12, 14, 17 then ask yourself the three questions you posed above. The fact is this is an engine (at least, and maybe not the full drivetrain, but the warranty covers that, too) that has been tested, evolved, changed, modified by GM not just over the last few years, but over decades. Sure, things have changed on it, in it, etc., but the basic engine is very strong and well designed and executed.

But with all that said, have you ever seen anything break that was brand new? Why do you think any co. offers a warranty on new things? If you want all or parts of your powertrain warranty to go away in the first few hundred miles, that's fine with everyone. It's your decision and the chances/possibilites of its happening because of the design and refinement of much of the components are in your favor.

But, before you make that final decision to modify your car, you really owe it to yourself to find out, in advance, just how much this could cost you if something goes wrong and GM says your warranty claim is denied due to a/all modifications. Notice I said a claim is denied, not that your entire warranty goes away; it doesn't.

Is it going to be $10, $1,000 or more out of your pocket? If you know that going in, then you are really ready to "play" and potentially "pay for your play," if it ever comes to that. I can assure you that no one on here wants bad things to happen but they sometimes do.

 

for the small increases in power that you would get after spending all that money is not worth it, to me that is. If you plan on racing it..and you need more speed or power...then perhaps changing all these things will do the trick.

The 436 hp that they say my car has is certainly enough for me. If I needed more power I would have gone for the Z06. I am not a pureist that needs things to be exactly as it came from the factory, I have certainly played with my 67 adding things to make it more comfortable to ride in and enjoy, and not so much having numbers correct parts.

I have been on this earth long enough to know, and I have to say I am a Chevy man through and through for 45 yrs now, if something goes wrong and they have an out, Chevrolet is going to say..sorry pal you messed with your car and you are on your own. Past experience has proven me correct ...so..just be aware.

Its your dime..spend it the way you want and good luck and enjoy your car. OH, I am also a Tommy Jr. fan, I just bought my new GS from him making it vehicle number 4 purchased from him...enjoy.

 

The CAI will not do much from a warranty standpoint unless you have MAF sensor issues. Some CAIs with oiled filters can cause issues with the MAF and more than likely they will say your CAI caused the problem if you have one. The headers and tune are different. In a lot of claims nothing will be said but if you have a major failure the first thing GM will ask the dealer to do is send them a copy of the code in the ECM. If they see evidence of a non authorized tune (which they can detect even if you reset the tune to stock) they will say your claim is denied. After that they come to look at the car to see what else may be going on. Just went through this with an engine replacement last year. My car was stock but the engine failed on the track and the ECM had a Manifold Pressure DTC showing the failure occurred at a speed of 113 mph and 2600 rpm. GM Rep stated for the repair order there was a potential for the Powertrain Warranty claim to be ruled invalid so authorized a Goodwill Warranty replacement instead. If the car hadn't have been stock I could have been out about $17K for the repair.

Bill

 

If those all the mods you're thinking about, and you're concerned with warranty, I'd leave it stock. Not a huge gain in power with those mods.

Now if you go more - cam, heads etc., that's a whole different deal, and go there assuming you have no engine warranty.