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For this issue, people are looking at the largest high-center bolts to the right and left of that QR code sticker. A 3 bolt subframe only has one of those bolts installed, 4 bolt has both.

You don't need to "look for" anything, if I'm understanding your question right. You're just going to record a new pull and send it back, and he will be able to tune further with that data. Of course if you notice something doesn't seem right or you have specific adjustment requests, you mention...

Cooler air is always better, a cooler engine isn't always better. My rule of thumb would be if you don't know whether or not you need a cooler thermostat, you probably shouldn't do it.

Opened mine up today and like others have said, I was very impressed with the build quality. Install was a little frustrating, especially that 3 o clock bolt, but it's not difficult. Anybody could do it in their driveway. Now I'm curious how a 3 bolt w/ AWR brace compares to the strength of an...

I'd of course rather see the proper parts installed than this PCM change bs. But what if they decided to pull some power from the launch to "protect" the bolt, and bumped up peak power to compensate? If the result of the "tune" was a faster vehicle, maybe there wouldn't be many complaints about...

I wonder if there was any incentive for an engineer to find a way to save a few bucks a car by subtracting parts? What really "bothers" me about this change is how minor the cost savings must be. They must have been very confident in the math that showed few failures will result. It doesn't mean...

Yup, even though peak hp would be the same on a dyno sheet with or without the IC, the IC will let you maintain all that power on those top end pulls. If you're never going go much past the speed limit, then it's a poor value proposition.

My understanding is that it's fine to run lower octane on a ZFG tune, the knock sensors still make the necessary adjustments. Although personally I think I'd just reflash the stock tune for the winter.

They were larger than what I had on hand so I did not. I put in a couple bumper style plastic push fasteners. Tommy's fix is good, and as he said, there is a ton of other hardware securing that piece. The rivets seem unnecessary.

All 21s have the rivets and removed that washer hose. No one has done new instructions for the 21s so it really confused me when I got to the rivets. But by that point you've come way too far to turn back so it's time to improvise.

I saw Mishimoto quote Spring 2022 as an ETA for their cooler, and I'm sure that doesn't account for possible manufacturing/shipping delays. I can't imagine any difference substantial enough to be worth waiting for.