Just diameter of the pipe.

 

Like jayc07 said it is piping diameter. The 60 is 60mm and the 70 is 70mm. RS means resonated and the RR is a non resonated header back (as opposed to cat back like the RS series).

 

Are these loud, cause I'm looking for something not too loud,just a nice sound while crusing and loud when drive in redline

 

it all depends on what's your definition of "loud" is. for me, q300 with berk 70mm hfc is loud to me while a lot of members thinks that's a quiet set up. the only quiet set up i know of is fujitsubo legalis r with stock cat.

so, it really depends on what's the sound level you're willing to live with.

 

This exhaust is comparable to the volume of the Amuse R1 titan 60mm single I use to have. Its not R1000 / 70RR loud but not very quiet by any means.

 

The 60 rs would be a better match for what you are looking for.

 

I just have to say... this exhaust took me 30 mins to put on. Ill post pics when I get home, I'm enjoying it soo much right now haha. The only thing you have to do is makes VERY small dents under the car, notch out a Very small piece towards the back of the car and fake off a support bracket which is only 4 bolts.

Install was easy so i would rate it 8/10 just because I had to dent spots and take the support bracket off.

The sound - LOUD. I stick out like a sore thumb in traffic... there is some drone but i can tolerate it. Being I've only heard the sound of a q300, I can say it is a bit louder.

Im going home in a few and ill post some videos and pics.

 

Since this was an easy install I don't think I need to post up "directions" on what to do. But enjoy the pics... you can always send me a message if you have any questions!!

 

+1

 

Just a quick question, how loud did the test pipe make your 60rs? i've got a 60rs single titanium and its really nice and quite (im guessing would sound similar to your 60rs dual?) and im thinking about adding a berk HFC. However I want my car to be legal though and the limit where i live is 90dB....I used to have a q300 w/HFC and that was ridiculously loud to me, definitely above 90dB. Any input will be much appreciated