best combo i've seen... AEM V2 intake, DC header, GReddy EVO, or EVO2 exhaust...the V2 intake makes more power than any other intake out there, and the EVO makes really good power as well...that's the setup i have V2, DC header, GReddy EVO...u said u wanted to make effective mods, go for the best...i already know somebody's gonna come behind me and blast intakes, fact is, the old AEM CAI for the accords didn't do shit, injen intakes from what ive seen dont do much...if u're gonna do it, do it right, get the V2. there's no intake on the market that can touch it. i dunno what it'll do for the new 4cyl, for my 00 4cyl it's rated about 8hp and 9ft-lbs of torque (at the wheels from AEM's dyno on the website), injen didn't do that. on the 03+ V6 it made around 18hp i think...so go with the V2, u'll be glad u did...im not sure if DC's got a header out for the new accord yet, they prolly do, but i'd get that, and a GReddy EVO exhaust. I wouldn't go with that weak ass GReddy SP cuz it's basically just a prettier stock exhaust...but it's still restrictive and basically for people that just want a bigger muffler...go with the EVO2, full stainless steel...u'll be glad u did