5 and 4 angle cuts are more for Amercian V-8 engines.


The reason it is not best for imports is imports have less metal on the valves to remove, so they can't do 4 or 5 angled cuts.


3 angle cuts is the best for your application.

If I was you, I would find out what CFM your are flowing in and out with all these mods you have. Bigger is not always the best power producer.
You really want to concentrate on velocity, not just sheer flow. Higher velocity will produce more power, better mileage and better response.

What is the CFM of the turbo? both sides?

I would start to see what you are flowing, this may help correct any problems you have later.

It would suck to have one cylinder run lean, like number 4 as it see the coolant last and get the hottest air from the manifold.

Also with these mods and not know the flow of intake or exhuast, you may get stacking in the intake being your turbocharged. Thats not good either.

Lets learn what you are flowing first!