Are you really sure for drag use only??
For sudden drag (road use), 4-1 is recommend, the weakness is poor low end torque.
For drag racing (race use), no need to use exhaust extractor, just direct blow to open space.
4-1 best for drag use... coz in drag races, u'll be utilising mid-high revs alot... hence, u need quick exit of ur exhaust gases... get a tuned length 4-1 extractor and straight piping is the best....
of coz wif this, ur low end sucks...
Yes bro, 4-1 extractor has poor low-end torque performance.
For stock engine, they are good in low-mid range torque output, like you say, it is design for daily use, but for modified engine like using high cam, the maximum torque output will focus on mid-high range. Now even using the 4-1 extractor, the car will go crazy on high rpm, but low-end rpm? you can imagine how worst it is ^_^
Since you are focus on race use, poor low-end torque and high fuel consumption should be no problem to you ^_^
erm..smtg interesting..btw my car is sohc..which my low-end ady good..i m looking for mid to hi-end//For a drag racing car its better u use 4-1 extractor. it doesn't really matter because it depends on the car u use and wat sort of mordification you do to your engine. If u tune your engine for more low end torque then 4-1 extractor with straight piping would be good. :P
For engine with high cam-shaft, over-size throttle, strengthen valve spring; using the 4-1 extractor will amplified the power on high rpm, because all this setting is focus on high rpm performance.
But talking about the stock engine with using SOHC, due to the cam shaft design, it is focus on daily drive with less fuel consumption, so the performance will focus on low-mid range.
Stock engine plus 4-1 extractor, actually it is not a good idea. The engine with good low-mid range performance but using the extractor that focus on high rpm output, this is very clear and show that it is not match with your engine, you will not get the performance you want, and end up with higher fuel consumption with less power output.
Making a extractor for the engine with high rpm output is very easy, just let the exhaust gas going out as fast as possible.
But for the engine with low-mid range output, that is totally different story, the extractor must base on the characteristic of the engine to build it, only the product that prof from the test lab can give you the correct answer, if not, you need to be a "tikus putih" to test the extractor one by one, in order to get the perfect match.
I think you have know the answer already, because the last post has give you the clear answer
I think more important thing is, you must know what is the reason you get all this part for, and how the part works.
Even you have all this performance part, with out proper tuning to re-write the air/fuel ratio on ECU, all this part is useless.
If this drag car is only use for race and not use to driving on the street, it should be fine.
If it is also your daily drive car, then you must very careful to drive it, if you did experience the power over weight before, you should know what I mean. Because you will be kill by your own car, don't over confidence.