BigCajun

iTrader: (1)

No issues. I really like the tone of it, especially at WOT.
I have stock exhaust, and to me it sounds good without being loud.
It does have a bit of a hissing sound. It's normal, from the design of the spiral baffle, but it's not bad.
Fit and quality are excellent.

Fister_Roboto

Racing Beat

Catalytic Converter Replacement Pipe for 04-11 RX-8 - Racing Beat

Hard to beat that in terms of value, quality, weight, and sound. I've heard a car running this midpipe, a Racing Beat Header, and an HKS Hi-Power single and it wasn't nearly as raspy as you'd figure. Very nice aggressive sound. Yes it was loud, but in a good way.

Fister_Roboto

Or, if you're baller and want to save even longer than it'd take you to get the BHR...

RE-Amemiya Sports Catalyzer SE3P

curly_drift08

Well I'm no "baller" persay but as of right now I'm in Afghanistan and the money Im getting right now is pretty nice. Like I said earlier , I just want a nice free flowing exhaust that with acutally help my Rx8 since from im reading everything it does has to have a whole different type of R&D to actual show better performance since the engine is all rotary and stuff lol. So Im going with the RB header and RB revi catback exhaust but I heard the BHR midpipe is far superior. I wont be back in the states until march so im doing all my own research now so when I get back I have a good blueprint for my car

shaggyp

iTrader: (2)

i have this setup without the headers and yeah its Loud but i dont mind hearing the flames popping out while wot

Mhogan10 KC

Hey my cat is going bad and i have been looking into Hi-flow cats (Specifically the rotary performance super cat) and multiple catless midpipes but every mechanic i talk to says not to go catless because ill loose the back pressure from the cat and then loose torque. In a bit of a bind here, thanks

BigCajun

iTrader: (1)

Hi, I'm pretty sure that going catless improves performance.
Headers, midpipes & aftermarket exhausts are a very
popular mod, & guys here wouldn't do it if it hurt performance.
Plenty dyno their 8s, so there is ample evidence of HP gains. The back pressure issue has been used as a sales pitch for cats for years.
I have the BHR, no complaints.

Mhogan10 KC

Thanks man helps a lot

RIWWP

iTrader: (2)

Common misconception for piston guys.

The short answer is: Rotaries don't need or use this mythical thing called 'backpressure'. The more open the exhaust the better (when it comes to power)

The longer answer:
"Backpressure" is mis-named. Basically, on piston engines scavenging is used to help pull exhaust gasses from the cylinders. The faster the exhaust velocity in the pipes the better the scavenging is. Now since we know that suddenly expanding gasses makes them cool down (ever use a can of compressed air? CO2 cartridge? It gets REALLY cold as it decompresses) and colder exhaust flows slower, we can see that for any given volume of exhaust gas, there is an optimal pipe size to keep the exhaust flowing fast and hot without creating a bottle neck. Get too big, the exhaust gasses cool down and slow down until there is enough flow (higher RPM) to be at the flow rate that is optimal for that pipe size. Get too small, and you are at the optimal flow rate at low RPM, but it just becomes a bottle neck at higher flow rates (higher RPM).


None of this matters for the rotary simply because we don't use scavenging. Open is better. You don't loose low end power, but gain high end.

"backpressure" if you take the term literally, only really applies to turbocharging, as the turbine will pool based ont he pressure differential between the exhaust manifold pre-turbine and the exhaust system post-turbine. The greater the differential, the faster it will spin up. This is how bolt-on exhaust nets easy gains for turbocharged cars, as it drops the pressure buildup post-turbine, increasing that pressure differential.

jonathan2006

iTrader: (1)

I'm about to order a bhr midpipe and thinking about getting one with the extra o2 bung just in case I would need it in the future. Does it anyone know if that comes with a bolt or something to plug the hole until it's needed?

Side note: I noticed reading thru this thread the issues with a CEL. Have y'all tried a spark plug non fouler?

BigCajun

iTrader: (1)

Don't know about the 2nd bung plug. I inquired about if I needed the 2nd, and I believe it's only needed for wide band tuning mods.
Fouler has been discussed, some say it works, others say no. Idk.
A search would get you better results.

yomomspimp06

just wait Jonathon and buy the full header/midpipe combo

Posted From RX8Club.com Android App

jonathan2006

iTrader: (1)

Wide band as in air/fuel ratio gauge and Cobb ap?

I think I'm just gonna get the midpipe for now

BigCajun

iTrader: (1)

Yes to the first, but I'm going from memory of a question I asked Charles at BHR. You can PM him and ask.
If you think you you may want to use it later, I think the 2nd bung can be plugged with a standard pipe plug from the hardware store, but I'm not sure.
I don't think mine came with a plug.

jonathan2006

iTrader: (1)

Awesome thx

TeamRX8

iTrader: (25)

Did it ever occur to you to ask them directly rather than asking everyone else instead?

signed,

Capt. Common Sense

jonathan2006

iTrader: (1)

Actually I did and hadn't heard back yet but thank you captain obvious

jonathan2006

iTrader: (1)

I sent it via Facebook since I don't get on here very often. I ordered it on Saturday and mentioned it in the notes on paypal. It's not a big deal I was just wondering.

jonathan2006

iTrader: (1)

Lol yeah I ordered the ignition with her card cause I was too lazy to get up and get mine. I appreciate it and can't wait to install the pipe. The ignition is awesome.

Supīdo-kyō

iTrader: (1)

so if i get a bhr midpipe with a second o2 bung, i would still get a cel??

RIWWP

iTrader: (2)

The 2nd O2 bung is just if you want a 3rd O2 sensor in your exhaust. In order to prevent a CEL, you need a cat or an ECU flash that blocks the CEL. Period.

Supīdo-kyō

iTrader: (1)

would the cobb accessport be the only way of blocking that cel code, or are there other alternatives i could use, without sending my pcm/ecu somewhere

RIWWP

iTrader: (2)

MazdaEdit is the other option

TeamRX8

iTrader: (25)

did they resolve the bricking issue yet?

RIWWP

iTrader: (2)

Neither solution is noob friendly when you take into account who you would be buying an AP from...