I hear the exact same thing with my headers but its not an exhaust leak so don't worry about that. Most noticable when you start the car up and its at idle. Sounds badass imo

 

Is it just me or do those look kinda poorly designed? Almost worse than the stock manifold.

There is more of an angle in pipes "1" and "2" than in the stock ones. And why would they not just make them as straight as possible and have then go into the holes as I show for each pipe? Do they have to be the same length for efficiency? Or does the air have to pass through the pipes into the the exhaust pipe at the same time? (I really doubt it) I know that twists and turns in fluids cuts efficiency.

(Here's my proposed design)


If I am wrong or missing something let me know.

 

There's this thing called equal length...

 

....and it tells you absolutely nothing. Equal length has it's benefits and its detractions. That is why there is also a thing called unequal length There are alot of considerations to make when designing headers and manufacturing headers - it's quite involved actually and relative to many other aspects of the engine.

KS0385 - you are right to a point, but remember, we have somewhat limited space to contend with as well. So often times, one has to engineer less than ideal bends in order to clear prexisting conditions.

 

I have an edit button..

Look i just edited.

 

Finally we're able to edit our post again. The bends are probably for clearance issues

 

great numbers.. that car is impressive with the mods you have.. wish i had the HR

 

Right you are. But in this case I would say that equal length is more beneficial than not. The numbers are clearly better. I believe the bends were done purposely to create equal length.

 

is that STILLEN headers on the top and look shorter than the stock?

 

do we have stock vs Stillen header internal diameter specs to compare ? ? ?

 

My stock headers are in the garage. Those I could measure. But I never did measure the Stillen's! Its a very visible differance I can tell you that.

 

im assuming them to be larger by a few mms (2-5 mm) . . like a gradual increase . . . or is it like the inlet port itself is larger than the stock ?

 

Ports & tubes are larger.

 

ok . . this maybe a noob question, . . . if the ports are larger then wont it make the stock cats and some hfcs unusable ?

 

Flanges and bolt holes still match up.