Exhaust Question - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

anonomousdrift · 03-10-2011, 07:53 PM

Okay so first a little background. Car is a s13, stock ka, has a straight pipe and custom exhaust from a muffler shop that the previous owner put on. I want to replace the exhaust because it sounds terrible and is falling apart and I dont really think its helping any with power. I've already decided on the exhaust I want, but I'm debating on whether to put a cat converter back on the car. I know since the car isn't turboed it needs some back pressure and so heres the question. Do I need the cat back on or will it be okay with a straight pipe? and if it needs the cat, should I put on the stock cat or a high flow cat? Any help would be appreciated.

For those that dont feel like reading everything:

Going to replace exhaust
Stock KA
Has straightpipe
Should I put the cat converter back on for backpressure?
If I put cat back on should it be stock or high flow?

03-10-2011, 07:53 PM	#1
anonomousdrift Leaky Injector Join Date: Jul 2009 Location: Irvine, Ca Posts: 65 Trader Rating: (5) Feedback Score: 5 reviews	Exhaust Question Okay so first a little background. Car is a s13, stock ka, has a straight pipe and custom exhaust from a muffler shop that the previous owner put on. I want to replace the exhaust because it sounds terrible and is falling apart and I dont really think its helping any with power. I've already decided on the exhaust I want, but I'm debating on whether to put a cat converter back on the car. I know since the car isn't turboed it needs some back pressure and so heres the question. Do I need the cat back on or will it be okay with a straight pipe? and if it needs the cat, should I put on the stock cat or a high flow cat? Any help would be appreciated. For those that dont feel like reading everything: Going to replace exhaust Stock KA Has straightpipe Should I put the cat converter back on for backpressure? If I put cat back on should it be stock or high flow?