i have the greddy sp2 catback exhaust with the SR motorsports hi flow cat and AEM intake.. when im hitting the gas like 3/4 from 4k to 5k it makes a buzzing noise it sounds kinda ricey.. is that what its suppose to sound like or is something loose? the thing is it only buzzes in the 4k-5k range

 

Sounds right to me. I have a clip on CD. If you can tell me where to up load it. I'll post it on here for ya. Its kinda ricey set up. Thats why I want HKS.

 

i want borla.. lol its not bad at all just that 1 rmp band is riced.

 

It's ricy because of your hi flow cat

 

if i got a mid pipe would the buzz stop?

do catless midpipes and high flow cats decrease your mpg?

 

A catless midpipe would increase the obnoxious noises, and that 4-5k sound will get louder.

A catless midpipe or high flow cat should not do anything to your mpg on a large scale. If anything they should theoretically increase mpg because they are more free flowing, will increase horsepower and decrease weight, meaning you can use less throttle to get up to the same speeds or starting from a stop. Only reason someone might see a decrease in mpg is because they get too happy with the throttle.

 

does a greddy and rp cat give the same rice sound? i dont want that sound. extra resonator?

 

No, There are two mov clips from RP with RP Supercat and Greddy SP2. One with windows up and one with windows down:

http://rx7.com/RPGReddyRX8exhaust/soundmovieclips.html

I've got the GreddySP2 and will get the RP supercat when available. I think a group buy may be in the works.

Combo sounds nice to me...

 

I got an 06 RX8 with the AEM CAI. and the Greddy exhaust... Absolutly no ricy sound for me... It may be the Cat pipe you are using... I plan to buy one with the group buy as soon as it is available.

 

I have the same and it sounds excellent. Not loud at all... well compared to when I had the catless midpipe on. I just had to put the stock cat back on for inspection. I'm thinking of leaving it on because it sounds so much better and most importantly my eyes aren't watering at every stoplight. I thought catless would be worth the extra bit of power but I was wrong!

 

does the super cat eliminate all of the cats? and are the high flow cats illegal?

 

Huh? Look at the name "Supercat." Yes it is still a catalytic converter, but it is a high flow unit. High flow cats are not illegal so long as you still pass the emissions requirements.