Just like the title says. If one has the RB street port (dual pipe) header and full exhaust, how much power can one make before the RB system becomes a restriction? IE will it work with a bridgeport, P-port, big street port??? HP?? 200, 225, 250 before it starts to be a hindrence instead of helping.

Anyone with real life data and not just bullshit bench racing rhetoric!!??

 

On a streetport I've heard it maxes out at 170. with a bridge I wouldn't expect anymore than 190 and no more than 210 with a periport.
https://www.rx7club.com/1st-generation-specific-1979-1985-18/racing-beat-exhaust-dyno-compairisons-823229/
Remember though a bridge ane peri port really need flow to amke power. So if youwant to make serious power it HAS to be loud.

 

Are these HP estimates with a 12a or 13B??

 

13b estimates... The rb exhaust is a great bolt on exhaust for daily driving. it's extreamly well built, quiet, and will give moderat power increases to stock and street ported cars. If you want maximum power from an engine you shouldn't have anything RB in the exhaust.

 

What about their presilencers? They're built to last and are good at getting rid of the harshness of the rotary exhaust note.

 

yes
they are friggen HEAVY tho...

 

if your looking for a optimum header design check this out! link below

https://www.rx7club.com/rotaryshack-164/new-product-release-shack-check-out-n-header-827013/

run a 3" pipe from the header back to a good quality 3" muffler and your good to go!

 

They are VERY heavy. Probably 75-100 Lbs. Luckily my car is a street car so I'm not overly worried about weight, but I am now considering a new approach, once the engine gets it's BP, which won't be for awhile. For now the RB is good enough.

 

What? They are most certainly not 75-100 lbs. Maybe 25-30 at most. Or are you talking about the whole system? If so, I wouldn't be surprised if it was over 100 lbs.

 

Since the OP was talking about the street port exhaust system, then yes it's about 75lbs for the center section.

 

Thats why I'm running the single tube RB system. For the little bit more power that RB claims you get going to the SP system I wouldn't be suprised if it is completely countered by the added weight of the extra tube.

 

The RB system does a great job of adding a little power and keeping it quiet. When I installed mine, I was REALLY suprised how heavy it was.

The original intent of my question should have read like...RB street port exhaust does good to add a little HP to a stocker, hangs in there great with a street port engine, maybe a little lowon a bridge port engine, becoming a restriction on a p-port engine, really choking it on a p-port with nitrous.

Any real experience with different varying levels of power with the system?

 

I put a new (new to me, all used pieces) exhaust on my gsl-se yesterday, and its pretty damned light. dual outlet RB header into a y pipe collector, directly into a glasspack pointed out under the passenger side door. popo thought my car was on fire when i let off the gas.

 

i made 120rwhp on my Racing beat/holly setup on a stock port 12a

 

I'll agree. The lump that I had after my center section dropped on my head while trying to install it single handed agrees too. It's a heavy SOB, but it keeps the small displacement buzz down with the thick walled tubing, and it holds up really well to the rotary's exhaust

 

the RB stuff is heavy, but A its really low in the chassis, and B its more like 30lbs than 70.....