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· NPM Lead Editor/Webmaster
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8,963 Posts
Randman said:
I am eliminating the cat, because that will give a big HP gain. When I need to smog it in 5 years I will put the cat back on.
That's old school thinking. Not true with todays free flowing cats. Plus on OBDII cars you need it to send the right signals to the ECU... You will get rid of the pre-cat when you install a header, but you need to relocate the O2 sensor behind the cat after the ("b") down pipe.

Big HP gains from removing the cat is a myth carried on from the early days when they did cause a big restriction. We have found Nissan factory cats to be pretty good. Just as good as many aftermarket cats.
 

· NPM Lead Editor/Webmaster
Joined
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8,963 Posts
Randman said:
This is all wierd to me, I just sold a MR2 Spyder to get this car, on the SpyderChat forums, you could talk about aftermarket performance and not get harped on for it. I didnt buy this car because it had 4 doors and 5 seats to haul my family around in. I bought it because it has a 2.5 liter making 175 hp and 180 torque. In my opinion, that isnt bad power, but I bought it to make it more powerful. Sorry if one more car will be polluting the air, but that is gonna be worth it to me when I get thrown into my seat every time I hit the gas.
yeah a whole 1/2 a hp will really throw you back in the seat... and driving around with your check engine light on all the time is not a real cool idea....which is what will happen....

You yourself said you are new to the Nissan platform.. Read and learn from the technical sections of SE-R.net, Sentra.net and NPM... many people have tried these things and tested many variations... use the knowledge to your benefit and learn from what others have done.

no one is harping on you about aftermarket performance... you obviously haven't read too much around here if that's what you think.. check out http://www.nissanperformancemag.com We did a Hotshot header review with dyno numbers on the Spec V a couple months back,,,and we will have the CAI numbers next month....

Todays cars are sophisicated, they use ECU's, MAF's, TPS, O2 sensors...etc..etc.. If you start pulling things out with old school thinking your car will have less power.

bottom line: If you weigh the good vs bad of pulling the cat... the bad out weighs the good.... do the research and I'm sure you will agree...
 
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