Eliminating upper Cat on stock downpipe?? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

dued · 06-21-2010, 04:42 PM

Car: 1995 S14

Hi, this might be a dumb question but here it goes: I currently have a stock header, stock downpipe, and stock cat with a 3" cat-back exhaust.

I noticed that the stock downpipe has a cat at the top of it, and a stock cat at the end of the downpipe. So I was thinking if I were to buy an aftermarket downpipe + test pipe, would the downpipe eliminate the upper cat? I know that the test pipe will eliminate the final cat, but my goal is to eliminate both.

06-21-2010, 04:42 PM	#1
dued Zilvia Junkie Join Date: Dec 2005 Location: Vista, CA Posts: 450 Trader Rating: (3) Feedback Score: 3 reviews	Eliminating upper Cat on stock downpipe?? Car: 1995 S14 Hi, this might be a dumb question but here it goes: I currently have a stock header, stock downpipe, and stock cat with a 3" cat-back exhaust. I noticed that the stock downpipe has a cat at the top of it, and a stock cat at the end of the downpipe. So I was thinking if I were to buy an aftermarket downpipe + test pipe, would the downpipe eliminate the upper cat? I know that the test pipe will eliminate the final cat, but my goal is to eliminate both.