cat converter replace/remove - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

blades · 01-28-2002, 05:50 PM

I'm on the east coast of canada, where if you don't know, we do not have to worry about smog and as far as i know allowed to not have a catalyc converter on any car made before 1991. that being said i have a 90 240 coupe and need to replace my current cat. would i gain horsepower by removing it and putting in straight pipe or would i be better off purchasing a high flow cat. if i put in pipe how loud will it be??would it backfire???

*Jeff240sx* · 01-28-2002, 08:34 PM

As far as I have heard, it is a horrible idea to remove the cat on our cars.
One of the biggest complaints is that is smells like rotten eggs.  And I have heard that it makes our little 2.4's sound like a tractor.
Not a pretty thing to do to a 240sx, IMO.
-Jeff

blades · 01-29-2002, 09:16 PM

so does everyone else agree that i shouldn't get rid of my cat??? if so could anyone recommend a high flow catalyc converter???prices?? thanks

Nismos14 · 01-29-2002, 10:30 PM

put a straight pipe on and if u dont like that THEN shell out the money for the high-flow

grahams14 · 01-31-2002, 10:58 AM

In the UK we take out the cats and replace them with straights. If you pair this with a 75mm downpipe and a large bore exhaust it makes more pops and burbles but you get extra HP and also you can shoot flames out of the tailpipe on overrun and sometimes on gear changes! This is obviously on the SR20det engine and not the 2.4 n/a motor you guys have. Would not have thought it would have any detrimental effect on yours tho?

tnord · 01-31-2002, 01:07 PM

high flow

Sick240 · 01-31-2002, 08:46 PM

Yes, its really not a good idea to get rid of your cat, unless it is a car with forced air induction, loss of backpressure, your car runs wierd on account of your sensor (fogot which one isback there) and it sounds like crap

drift freaq · 02-01-2002, 12:33 AM

high flow cat is the way to go

*transient* · 02-01-2002, 10:43 AM

Yup, high flow is the way to go. Hah, it rhymes!

rabbit23 · 02-01-2002, 11:43 AM

mine is hollowed,  it isn't as loud as most of the imports i hear. i don't set off alarms or anything. i don't have any bad fumes or loss of bottom end, or engine codes.

nos240 · 02-01-2002, 09:01 PM

i dont know about yall but i heard good thing about pdm's down pipe. it's pretty a straight pipe that replaces the cat. i've never actually experience it myself, but im thinking about doing it soon. a lot of ppl said that they can feel more power at high rpm, and not losing any power at low rpm.

blades · 02-01-2002, 09:43 PM

How does a down pipe replace the cat??? doen't a down pipe just come down from the headers/exhastmanifold and join to the exhaust eystem???

01-28-2002, 05:50 PM	#1
blades Join Date: Jan 2002 Posts: 41 Trader Rating: (0) Feedback Score: 0 reviews	I'm on the east coast of canada, where if you don't know, we do not have to worry about smog and as far as i know allowed to not have a catalyc converter on any car made before 1991. that being said i have a 90 240 coupe and need to replace my current cat. would i gain horsepower by removing it and putting in straight pipe or would i be better off purchasing a high flow cat. if i put in pipe how loud will it be??would it backfire??? __________________ Team Canada #1!!!!!!!

01-31-2002, 08:46 PM	#7
Sick240 Leaky Injector Join Date: Jan 2002 Posts: 114 Trader Rating: (0) Feedback Score: 0 reviews	Yes, its really not a good idea to get rid of your cat, unless it is a car with forced air induction, loss of backpressure, your car runs wierd on account of your sensor (fogot which one isback there) and it sounds like crap __________________ 90 240sx Coupe

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

01-28-2002, 08:34 PM	#2
Jeff240sx I hate you too... Join Date: Jul 2001 Location: Tampa, FL Age: 42 Posts: 5,828 Trader Rating: (0) Rides Gallery: Jeff240sx Feedback Score: 0 reviews	As far as I have heard, it is a horrible idea to remove the cat on our cars. One of the biggest complaints is that is smells like rotten eggs.  And I have heard that it makes our little 2.4's sound like a tractor. Not a pretty thing to do to a 240sx, IMO. -Jeff

01-29-2002, 09:16 PM	#3
blades Join Date: Jan 2002 Posts: 41 Trader Rating: (0) Feedback Score: 0 reviews	so does everyone else agree that i shouldn't get rid of my cat??? if so could anyone recommend a high flow catalyc converter???prices?? thanks

01-29-2002, 10:30 PM	#4
Nismos14 Zilvia FREAK! Join Date: Jun 2001 Location: New Jersey Age: 43 Posts: 1,213 Trader Rating: (0) Feedback Score: 0 reviews	put a straight pipe on and if u dont like that THEN shell out the money for the high-flow

01-31-2002, 10:58 AM	#5
grahams14 Leaky Injector Join Date: Jan 2002 Posts: 61 Trader Rating: (0) Feedback Score: 0 reviews	In the UK we take out the cats and replace them with straights. If you pair this with a 75mm downpipe and a large bore exhaust it makes more pops and burbles but you get extra HP and also you can shoot flames out of the tailpipe on overrun and sometimes on gear changes! This is obviously on the SR20det engine and not the 2.4 n/a motor you guys have. Would not have thought it would have any detrimental effect on yours tho?

01-31-2002, 01:07 PM	#6
tnord Nissanaholic! Join Date: Dec 2001 Posts: 1,975 Trader Rating: (0) Feedback Score: 0 reviews	high flow

02-01-2002, 12:33 AM	#8
drift freaq R.I.P. Aya, always love Join Date: Nov 2001 Location: Los Feliz/Hollywood Posts: 18,564 Trader Rating: (215) Rides Gallery: drift freaq Feedback Score: 215 reviews	high flow cat is the way to go

02-01-2002, 10:43 AM	#9
transient Premium Member Join Date: Jun 2001 Location: Los Angeles, California Age: 41 Posts: 2,947 Trader Rating: (0) Feedback Score: 0 reviews	Yup, high flow is the way to go. Hah, it rhymes!

02-01-2002, 11:43 AM	#10
rabbit23 Zilvia Member Join Date: Jun 2001 Posts: 252 Trader Rating: (0) Feedback Score: 0 reviews	mine is hollowed,  it isn't as loud as most of the imports i hear. i don't set off alarms or anything. i don't have any bad fumes or loss of bottom end, or engine codes.

02-01-2002, 09:01 PM	#11
nos240 Leaky Injector Join Date: Jan 2002 Posts: 69 Trader Rating: (0) Feedback Score: 0 reviews	i dont know about yall but i heard good thing about pdm's down pipe. it's pretty a straight pipe that replaces the cat. i've never actually experience it myself, but im thinking about doing it soon. a lot of ppl said that they can feel more power at high rpm, and not losing any power at low rpm.

02-01-2002, 09:43 PM	#12
blades Join Date: Jan 2002 Posts: 41 Trader Rating: (0) Feedback Score: 0 reviews	How does a down pipe replace the cat??? doen't a down pipe just come down from the headers/exhastmanifold and join to the exhaust eystem???