06-14-2010, 11:17 PM
out of all honesty, unless your driving through water 12" high a cai is perfectly fine. i give a +1 for the volant, one of the best intakes for the zetec. like nik said 2.25 is fine, back pressure wont be had from a catback, as you have a very restrictive manifold and catalytic converter up front.
2007 ZX4 2.0l unaturally aspirated
FSwerks stage 2 Turbo kit, Cosworth Intake Manifold, 3" custom HKS turbo back
regular stage 2 @10ps : 232whp/219wtq
stage 2 plus @ 13psi: 278whp/229wtq
Stage 2 plus @15psi: 296whp/240wtq
2013 Focus ST Tuxedo Black - The daily
FSwerks stage 2 Turbo kit, Cosworth Intake Manifold, 3" custom HKS turbo back
regular stage 2 @10ps : 232whp/219wtq
stage 2 plus @ 13psi: 278whp/229wtq
Stage 2 plus @15psi: 296whp/240wtq
2013 Focus ST Tuxedo Black - The daily