That doesn’t sound right. I would figure the 15-17’s would have more to gain and the 18’s would be minimal, since it’s the model’s factory manifold. It would be like a 2015 with a ported ‘15 manifold.
This is on a 15-17 with their sub-par manifold in comparison. I'm talking 18+ GT with a ported manifold over the stocker.I think That's a pretty good across the board spread.
VMP doesn't have a dog in this fight and have found them to be pretty upfront and honest
A good video
If your determined to go that route.....Won't get much more with other options
Probably shines even more with other mods
Negative. That's ported 18 manifold vs unported 18 manifold on a 15-17 car.
There. Other mods too. There's not much in it. Better? Sure.
That would be an interesting test on a boosted application.
Not my car. That ^^^ was on a 2018, though. There won't be a significant difference in gains between a 15-17 vs on an 18. The head ports aren't really any different (thus airflow), and the tiny increase in displacement won't show anything that's outside of measurement area.
