[Mazda hp]

I'm thinking abought putting a 4-2-1 header in a 07 Mazda 3i my brother gave me. I already put a K&N filter in the stock breather, 60 mm throttle in the place of the stock 55 mm throttle body, 2.5-inch cat back with a straight through muffler in place of the 2.0-inch stock cat back. I was wondering if anyone could give me an idea of how muck hp I might get by adding the header along with the rest of the mods?

Thank you for your time,
Daniel

 

[Alian]

Daniel

mazda 7 3I stock have about 150 HP did you put it on the bank before you change the parts .

 

[Mazda hp]

What do you mean did I put it on the bank before I changed the parts?

 

[Alian]

What do you mean did I put it on the bank before I changed the parts?

Horse power bank then you know the technical condition of the engine

 

[G ~ Mini]

As mention by @Alian ... dependent if your engine not losing or lost power you will probably add about 25-30 HP with a tune to maximize that set up