Not to disagree but not too long ago several of the Well Known Z specialist here said that the larger pipe would cause a lost of HP... They've come along ways since then and now even the noob's know that letting the turbo's breath is good..i.e eliminating cats, using larger exhaust increases HP.
Mod www.nissanturboforum.com Nistune Dealer www.aaa-hiperformanceauto.com