Thread: Headers Dyno Comparison Thread

I know the common names for some of these transitions are fuzzy, but traditionally a "reverse megaphone" is a transition from a larger pipe to a smaller pipe with respect to the direction of flow. A reverse megaphone is traditionally placed immediately after a (regular) megaphone. See this image for reference:

The last inch or so of that piece on the left is a reverse megaphone. The middle section is a megaphone, and the right section is the 4-1 collector.

If those are pictures of your header, it looks like you have a megaphone transition, but not a reverse megaphone. This is a good thing. You don't really want a reverse megaphone on a header unless you're dumping it, and you're running a full exhaust I believe?

Got mine (ASP) on the car yesterday, and I can feel the difference from 4700 UP. Out of VVL it feels a bit weak, but I beleive that's related to the activation point, I'll try to hit up the dyno today and see.

Macakin: Nice, post dyno sheet, when you are done.

Yes, in fact that picture is of my header before it was shipped to me

Yes, I have a full exhaust.

I need to remember the multiquote button. Sometimes computing > happynole

It's called a reverse cone, and I don't see a megaphone or a reverse cone on Joe's setup. Looks like a nice transition piece to me.

hope u do good man ...post a video if u can

Like I said, the common names for these parts/transitions are so fuzzy and imprecise...

Could you tell me what the difference is between a traditional "megaphone" and what you're calling a nice transition? As far as I can tell, there is none, unless you're talking about the angle of transition. I think a 7 degree angle is ideal (or something around there) so is that what makes a transition a "megaphone", having the perfect angle of transition?
Or?

Megaphone:Megaphones

If you can't tell by the pictures, words won't help.

You're kidding right?