All copy here copy there de la.. should c wat taiwan tuner can do.. wat u wan they can do, even can make ur car sound like boxer engine. just go through some taiwan tuning mag. nice....

Lol i thought if wan boxer engine sound just connect 1-3 2-4?
nope.. that will make ur car no power.. look like they extend 1 longer to 4 that it..:stupid:
sorry .. may i know what did you guys mean the 1-3 2-4 ?
i still doubt on the connection from extractor to piping.
current setup:
local made 4-2-1 (the 1 is short only 2.2") + portion 1 from stock extractor 2.3" (remain o2 sensor..etc) + 2.2" flexi + 2.2" bullet + 2.2" piping then straight flow muffler.
im not sure whether reuse the portion 1 from stock extractor have create any abnormal air flow (2.2 --> 2.3 --> 2.2)
Cylinder number.
Actually you can call them to install o2 sensor on your current extractor, why need to mix and match with stock
BTW the boxer engine design of long short extractor also made it lose around 20-30hp. The sound is not from the engine, but the extractor