i noticed the small amount of welds near the flange.....are you compensating for the heat thats being put into that by doing it that way........if not you should cause that flange will pull into an arch....you know what i mean....so make sure you do them in sequence.....and let them cool....you dont want that to warp that ---- would suck

 

that was the first one I built for my wife's car. its just a classic 4-1, but equal lenght with a megaphone. That one was dynoed vs a 4-1 dc sports with a 2.5" collector.

the red graph is the Dc 4-1 tuned at a a/f ratio of 13.5:1
the blue graph is my 4-1 that was not tuned yet, just bolted on and changed the vtec point from 4600 to 6400 rpm's





im not done welding. I always weld the runners to the flange while its bolted to the head, that way it won't warp the flange. It will also be welded inside and out at the flange.

 

holy chit! Keep us updated you've inspired me to get my *** in gear, and learn how to tig haha

 

ill keep you guys updated as soon as I get it dyno.

 

Wow that looks great. You done much new to your car this winter?

 

15whp at one point untuned over another aftermarket heater. That's nice.

 

I repainted the engine bay and did a wire tuck. Im in the process of putting the motor togheter, allong with a new manifold and turbo.