I am rebuilding a sand dragster the was VW powered and swaping in a 13B. When fabing the headers will I lose power if i use a Zoomie style dragster header, just two pipes sticking up in the air? Or should i merge them into one and add a muffler. The motor will only be run in the 6 to 8K range for short times and a sand track in only 300 feet. Noise is only a problem at the house tunning it.

 

if the engine is stock port-ish two pipes will be fine. it'll be very loud, like 130db+ so even the "noise isn't a problem" people will probably say that's too loud!

 

As for now it has stock ports with a 44mm sidedraft carb.

 

I would put a muffler on that, i have mooved my car with S4NA engine and only headers mounted, and that was too loud, it's just not drivable.

 

yeah it'll probably end up with a muffler but try it without, its astounding

 

You risk having the nearest big airport call you and ask you to keep the noise down.

 

Ok, so I will merge them and run a muffler. How long should the pipes be?

 

Hi Michael, This is what I fabricated. Bought a racing beat flange and used some sprinkler pipe (for added wall thickness and noise deadening) then cut up a new cherry bomb muffler to "borrow" the baffles to meet our noise specs. Still got a nasty bark but it sounds sweet! With my clutch set up I'm turning around 7900-8100 rpm's.