OK i can't wait any longer, ordering now. I've had my eye on this one for several months now. no more excuses, my old can sounds like *****.

 

lmao, i thought i was just cause you work on Mercedes... right?

 

Haha, yeah.
I'll try and get a video this weekend of a drive by

 

The funny part is I just learned about this muffler because of this thread. And I thought I was fairly familar with RB's products. Where have I been all this time?

 

Yeah it's a shame it's so ugly.

 

Robert @ RotaryShack was the one to tip me in on it - they're still very very new.

 

After much hemming and hawing i'm leaning towards your exact setup: Collected 3" header into 3" RB silencer into PR extreme.

Would love to hear the drive-by on this setup!!

 

So tuff. Love everything about it, keep the updates coming man!

 

You're gonna lose low end power if you do that. Otherwise I'd ask how big of a bridgeport or peripheral port do you have and where is your expected powerband?

Just do a long primary collected to 2.5" and get the 81-82 muffler. It'll make more power and be quieter on the street. But now we're cluttering up this guy's thread.

 

Chatted with RacingBeat today and he said on a largely ported engine (which my 6 port is) they suggest 2" of pipe per rotor and do not restrict it at all. He said for my application he would suggest 4".

 

4" on an NA? I find that extremely hard to believe. So they're saying to collect two 2" pipes into a single 4" pipe? That RB guy is smoking the pipe. Are you actually going to try it?

 

I'm looking at a nearly identical setup as Ultimate J (Who is also running NA mind you )

 

Nice work there Jay! Under the sway bar too!!

I have more blown out Magnaflows than useful ones. And their aluminized coating burned off the muffler on my V6 Isuzu but not on the REPU for some reason :-(

 

Thanks, the only problem with going under the rear end is that the exhaust sits really low.

I would recommend not going over 3" after the collector on a street car. My race car is only 3". Also if you plan on running two 2" pipes all the way back to a single muffler and want to use a wideband o2 sensor than you have to run the wiring all the way back to the collector or use two o2 sensors which is expensive

 

Sent from my iPhone

 

What's not to like about that???!!!

 

very nice sir

 

The "Puerto Rico Extreme" power pulse muffler from Racing Beat is part number 16436. It is made in Mantova ITL by Italian exhaust manufacturer CSC (silenziatori speciali per auto) and is marketed in the USA by Racing Beat.

http://www.racingbeat.com/RX7-1975-1...sts/16436.html

 

I still dont get it. Whats so exciting about a PR primaflow muffler; only difference the old and new is the 3" inlet. Otherwise, it still has the metallic noise.

 

Its actually a 2.75" O.D. - but not just the inlet. My understanding is its internally that wide as well.

I chatted with a rep from RacingBeat about it, he said that they couldn't go to full 3" because there wasn't much muffling going on - too much space taken up by the pipe.

Agreed though, still rather metallic. I'm currently thinking about 2 of the universal pre-silencers into one of these.

 

I just wish RB made a 2.75" turbo II pre silencer to go with it. The current ones are heavy walled and make a huge difference with the metallic sound as they reduce the tinny sound.

 

Didn't you read my thread? I used a 3" pre silencer and I don't have any tinny sound. Car is actually too quiet now

 

It's called quiet. I can hear your exhaust a mile away. I have picky neighbors and live in a gated community.

 

I gotta say man - by no means would I consider your exhaust quiet....

In fact it's from watching those vids I'm going to try 2 of those 3" silencers.

 

So after several people telling me to try just one silencer first, i took the plunge and got a similar setup.

Here's how it turned out:

FB RX7 hill climb cruise - YouTube

This is an S5 6-port large street port
Rotary Shack MaxPower 3" collected header
Racing Beat 3" universal silencer
Racing Beat PR Extreme muffler



Both of our vids seem louder than they may actually be - the tone is very aggressive however decibel wise this is quieter than stock under most driving conditions.

IRL i'm amazed at the sound - its total sleeper status. You will never hear these beasts creeping up behind you