bro..
reduce diameter exhaust to 2 inch 1st..ur engine 1.6 rite.dont use straight flowlh.its n.a not turbo maa..use 2 bullet tanabe n ending with mugen s-flow.use air filter stndard or mugen typelh.dont open one..n.a not same with turbo either u modified one..try use adjustable pulley..this suggestion to improve low end speed ur vtec..
low cost, n now see the result..n then u can upgrade slowly with ur gearbox,ecu,high/racing cam, piston,crankshaft n etc if u have more budget..try ok.gud luck:wavey: