91_fc

i'm finally gonna get my 91 n/a on saturday! ive been looking around for intakes and exhausts. i just wanted to know which kind of cold air intake and exhaust is the best for RX-7's. thanks.

1987RX7guy

iTrader: (3)

Best performance you can buy from exhaust is the mazdatrix true duals.(sit down when you look at the price) and any true CAI designed properly will do but ofcoarse I have made one for the N/a which will fit your N/a and there are other companies that sell similar ones but chances are that your broke and poor just like all the other guys on here so just make your own from universal parts and you'll save maybe 30 bucks.

Santiago

91_fc

thanks

1987RX7guy

iTrader: (3)

Just wait untill the people that don't agree get ahold of the thread.




I still have yet to see a dynosheet to disproove the duals. So untill then its all theory.

91_fc

i went to mazdatrix? which are the true duals? the HKS, Racing Beat, ?

1987RX7guy

iTrader: (3)

The true duals can come with either muffler. Both HKS and RB are straight through so its just more bling bling cost for HKS stuff and I have heard its louder with HKS cans. I own the RB setup.

91_fc

does the exhaust pass legal sound level?

1987RX7guy

iTrader: (3)

Oh crap does LA mean LA california? if it does then forget it. You will get a ticket for no smog lol. Any aftermarket upgrades in cali are illegal AFAIK. But they aren't that loud but I haven't taken a DB meter to them yet.

noseated

yea i was wondering the same thing... i search everywhere and cant find a intake for a na fc and mabye if u guys have spec sheets that would be good. and videos of it being dynoed

Tsunami

yeah your a pretty much limited to a drop in K&N filter and a new muffler in Cali, if you look hard enough you might find some cai's that are legal.

1987RX7guy

iTrader: (3)

There are only three CAI's(real ones not CAI wannabe's) and they are all based on the same thing steel pipe routed to the front of the car. I also think you have to be approved by the state of california to be smog legal which costs the vender $$ so yeah I am not going to pay for that. As it is I am in the red.

Sideways7

iTrader: (7)

As for the intakes, I think the Apex'i intake is the best. There was a test conducted on a Supra using the Apex'i, HKS, K&N, and one other filter that I cant think of. They dyno'ed them then attatched them to a vaccuum cleaner to test which one filtered the best. I think they all produced within 1 HP gains - between 13 and 14 HP (note, this is on a mrkIV supra turbo) As for the filtering, the Apex'i was the excellent and the K&N was very good, but the HKS was just plain awefull. I'll try to dig up the link to the article.

91_fc

OK. thanks

1987RX7guy

iTrader: (3)

Yes I agree the apexI filter is the best. But thats 99 bucks on its own O_O and its not a CAI. ping!

bingoboy

the only carb legal (as far as i know) intake kit for the FC is the hks super mega flow, however i don't recall if its for an s4 or s5. i run an apex'i intake and never got into trouble with it in LA, however you can't pass smog with it.

as for exhaust, mine was pretty loud (racing beat header, presilencer, and borla exhaust), but i had no problems as long as i didn't do stupid stuff around cops. no emissions either...just be sure to keep your emissions so you can pass smog check later, either that or you will have to get an un legal one.

edit: stay away from N1 style mufflers if you are worried about being too loud. my buddies FC with header, presilencer and dual N1's gives me a headache when i ride around in it...and i can hear him from half a mile down the street.

bingoboy

where can you buy JUST an apex'i filter?

Sideways7

iTrader: (7)

Ok, heres the article: http://www.mkiv.com/techarticles/filters_test/2/
The other filter was the Blitz filter. Another thing thats better about the Apex'i filter is that its a dry filter (no oil on the filter) that requires no maintenence and never needs to be replaced.

Sideways7

iTrader: (7)

I'll second that. I've got an Apex'i single N1 with a RB presilencer/DP combo, and its very, very loud. Its particluarly loud at the moment, but I think I have an exhaust leak somewhere. Hopefully its not something else.

1987RX7guy

iTrader: (3)

I don't have the link on this PC but I have it on the home pc. I searched for a good while too but its still not worth buying a filter that expensive to me.

ballsdeep692003

screw legal ****

BDoty311

The best filter is a K&N filter. All other similar filters copied off thier design.

True Duals make some good power. But $1200 for exhaust is alittle too pricy for me. You could make an exhaust for much cheaper and get similar results. Same with intake, buy a K&N filter and adapter, and route some cold air to the filter. Then box off the cold air from the engine bay.

blackpeoplejump

www.optauto.com has all the parts you would need pretty good prices, if you want a really good price pm me and ill hook it up because i have a license

Ni5mo180SX

AFAIK, the Apex filter is supposed to be replaced after a set amount of miles just like other OEM dry type filters.


The difference in design has already been stated. The link also shows the difference between K&Ns & Apexs filter.

Sideways7

iTrader: (7)

Woops, guess I should check around before I believe everything that site says.

bingoboy

actually he was just using common sense. alot of places simply call it a "zero maintenance" filter with nothing stated about its lifetime length...i cleaned mine out with some compressed air from the inside, no idea if that hurts it or not, but it got all the big crap out.