While this may be a very dumb question.....in my years of building small block chevys....this would qualify as a 4-1 header.

I'm out today doing some cleaning and changing under the hood of my new box. This is what I see when I remove the heat shield....any input is greatly appreciated.



-Kevin

 

Yep, that's the stock exhaust manifold. I don't understand how an aftermarket replacement one is gonna flow much better than that.

 

that is the stock crap lose it it restricts so much go with the dc sports ceramic hedders or somethin similar

 

the aftermarket ones are equal length, and the length of the header before the collector is longer. Maybe even a bigger diameter, but i dont know about that

 

I noticed very little change when I went from stock to MMW 4-2-1 header. If you want gain (low $ gain), go with Axle Back Exhaust, SRI, and/or Pulley.

 

yeah isnt toyota great?! 4into1 header factory. The rest of the exhaust is a little restrictive tho, get an axle back.
The factory intake is also very well designed unless you just want it to sound louder buying a cai is kinda worthless. You want power? force feed it! zpi turbo or greddy.

 

i remember havin this same conversation with my friend awhile ago