Header, Intake, & Exhaust - hi- flow cat

planning, exhaust and headers, is a high flow cat necessary?:eek:

No.

ive heard thaT they are not that high flow and not worth the money unless you are goin fi (forced induction)

I have a Random High Flow (http://www.randomtechnology.com/honda.html). You'll notice your exhaust will be a bit louder, you might even notice a boost in hp, but it's not necessary.

would you recomend if you were gunna mess with it the use a high flow or run w/out...this may be a dumb ? but if i orderd something wrong it would piss me off...when i get a d16 i should order exaust stuff for that motor such as the cats right?...i always thought most cats were universal but if u need to order by part no. then it should be for the other car not my 91 right?

I would recomend trying to get the cat for the d16, but it all depends on your states emission laws. A straight pipe wont pass in California.

most cats are universal, yes. Also they are still restrictive so you wont get much out of them. Maybe with FI you will see a little gain... but dont go w/o a cat period. It will reduce the backpressure that your engine needs, not to mention its illegal.

so if im gunna turbo later on it may benefit fromt he high flow? yea i have heard that it gets really loud as well but i dont know if i have ever heard a car w/out one...do they get real nasty sounding?

I have Ractive headers and a downpipe, and a RACTIVE high-flow cat to match along with 2 1/4" piping all the way back, and a SS Magnaflow Exhaust, and yes it is extremely LOUD if you step on it, my car is definitely one of the loudest anyone has ever heard, I'm going to buy a silencer to hopefully muffle it a bit, the cool part is that if you shift before 3,000 rpms it's fairly quiet (comes in handy with cops around) I also live in So Cal, but luckily I have a guy that can smog anything for $150.00 Also, my 1st o2 sensor is in the headers and my 2nd is just tied down in my engine compartment (loose) My check engine light hasn't come on so I have picked up the extension to run it back o the aftermarket cat. (It's been 3 months) Also the"Aftermarket Cat's" as they call it is not really a catalytic convertor, just a resonator which makes your exhaust even louder! My power increase has been very noticeable especially 4,000+

i bought a hi-flow cat for my car and found out when i went to put on everything from the header back that there isnt any room for the cat. the second piece of my header connects straight to cat back. so i wasted $55 on a catalytic converter. my car is definatly the loudest around where i live and i dont have a cat so if that makes it louder than i would hate to hear it then

not running a cat will make it WAY louder!

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a high flow cat is not a resonator. and it will make your car a little louder than a stock one, but just pick a quieter exhaust. and like Leviii said, cars dont need backpressure. its harmful to engine performance. but still, dont gut the cat, the bigger diameter piping will hurt your power badly, due to loss of exhaust velocity. and running w/o a cat is illegal everywhere in the USA, its a federal law.