I've got a Megan SS 4-2-1 header installed on my 97 Base Prelude, as well as other three 02 Civic Si. After 6 months, I am still very satisfied with the sound and the power gain. You will definitely feel the power after 3k rpm.(so strong and smooth).
Very high quality and problem free. I highly recommend it~ :clap
Probably you guys will say "Go for the best/name brand or something like that", but Megan header has the best value ratio. Compared with DC or Greedy, which costs you more than $450+, I paid only $160 including installation. (If you think Greddy header is more expensive because of its quality and high costs to produce, then you are wrong. You are just paying for the CARB exempt and "intangible good will")
Presume:
$450 Greddy gains 25whp - $18 per whp
$900 Mugen gains 35whp - $25 per whp
$110 Megan gains 7whp. - $15 per whp.
though there's less hp gain, for the money of investment and return, I will go for Megan.
Cost FYI:
The reseller price if you have a reseller permit (My bro checked it for me)
SS - $90-100
Ceramic - $45-50
(Most of them are made in China, but some of them are made in Taiwan)