Is the "D&B midpipe" and "RP midpipe" just like a "down pipe"?
Looks like the RP is better HP gain.

What they say:
** We recommend purchasing the bolt/gasket kit and 02 Simulator with the midpipe**

Made from stainless steel, 3" mandrel-bent piping with cnc-machined flanges,
the RP mid-pipe has been test-fitted
on numerous RX-8s to ensure proper fitment. A resonator is
also included as part of the pipe to keep resonances at
bay. This pipe eliminates thecatalytic converter. As such, this pipe is sold only for
off-road or racing purposes.

As can be seen from the dyno chart below, power gains from just this pipe
alone is slightly more than 10hp at the wheels. Add an aftermarket catback exhaust and total HP gains are around 21 to the wheels.

 

Oh yea why it say RX-7 on that dyno?

 

1 - You have to view any vendors power claims with scepticism, (your mileage may vary!)

2- The graph says RX7.COM because that is the name of the RP website.

3 - If you think you'll get another 10 horses from a cat-back, on top of the claimed 11 from the pipe, see #1!

S

 

Yea but are they the same as a downpipe?
I think they are right?

1 - I know its a "claim". No big deal. With HP there gos you gas mileage.
2 - Thank you.

3 - ... Is it still called a "cat-back" if it don't have a "cat"?.

Thanks,
Gilbert.

 

Yes, same as a 'downpipe'on other cars.

Exhaust has three parts -
1 - header '3-into-1' type, with primary O2 sensor,
2 - catalyst, with secondary O2 sensor, then steel wool filled resonator,
3 - 'cat back' pipe, with huge muffler and two outlets.

The replacement middle part would be called a mid-pipe, test pipe or cat delete pipe.

S

 

OK as of know we dont have a Turb/SC kit out an there may not be one for some time. SO... This is my plan: get some good HP gain(s) from the basic mods IE: Intake, Exhaust, Mid pipe, Suspension, ect.

1. Mid pipe from RP.
2. Stainless Steel High Flow Catalytic Converter Exhaust System from srmotorsports.
3. Ram-Air Cold Air Intake System from srmotorsports or K&N's intake.
4. Underdrive Power Pulleys from srmotorsports.
5. Exhaust from HKS or Greddy's SP2 Catback Exhaust.
6. Suspension from Tein/CS Coilovers.

OK tell me where I went wrong if I did and if I missed one. First I will dino the car. Then get the mods and dyno once more to see where I stand with HP gains.
Tell me your input.
Thanks,
Gilbert.

 

While in most cases this is true, I can testify to RPs claims. RP is about 10min down the road from where I live, and is definteley the most respected performance shops I know of. Their claim on the RP midpipe + greddy exhaust is unbeleivable but actually accurate. I will be putting that set on my 8 as soon as an intake I like is released.

 

I say BS. No way getting rid of your cat, and getting a cat back will give you 20+ hp. I'm inclined to believe Racing Beat that even with a complete straight thru design & muffler bypass they were getting 9-10 hp gains. With Canzoomer they were reporting 5-8 hp with the hi-flow cats. Most cat backs are only adding 1-3 hp. I think a realistic 8-10 hp gain is closer to the truth, not 21 hp.

 

We can make up hp in theory all day long, the only way to answer this is with a dyno read. Oh wait... they already have a dyno read on there website. I guess its a fake dyno. Easy way to criticize.

FAKE DYNOOOOOOOO.

Even though that company has such respect and a solid reputation... It must be fake.

http://rx7.com/RPGReddyRX8exhaust/im...reddy_dyno.gif

 

You can't have a straight through midpipe and a high flow cat/midpipe. They are the same part, just one has a high flow cat on it and the other has no cat whatsoever.

 

How about companies like K&N, Borla, Greddy, etc. Are those companies reputable enough for you ? They all have dynoes on their websites claiming high hp gains from cat back exhausts and air intakes. Borla & Greddy ads have claims up to 12 hp yet when many, many of the people on this website dyno their cars they get about 3 hp. K&N was claiming 9 hp for their intakes on their dynoes, yet when people dynoed them they got 1hp to 3hp on the upper end. So why have these dynoes on their websites claiming massive hp gains ? Because they want to SELL PRODUCT. They hope some uninformed customers believe these claims and buy their product. They would probably not sell nearly as much product if they had a 1 or 2 hp gain for $300 for an air intake, or how about 3 hp from a cat back for $600. It's not appealing, but it's much closer to the truth. The reason I believe companies like Racing Beat is because they don't make claims of massive hp gain. They say 3hp to 4hp gain, and people on this board who have ran their cars independently confirm that. I would love for you to show me an RX8 with the Borla/Greddy exhaust that gained 12 hp (like it claims on some of their vendor's ads). It's all about independent dyno verification, not what they have on their website...no matter how reputable they are.

 

my borla makes about 20 hp worth of sound. I don't know how much of that sound gets put to the wheels though.

 

Looks like 66 runs between dynos to me

DYNORUN.070
DYNORUN.004

 

Yea I think people got decibels mixed up with horsepower LOL!

 

You have a valid point... I guess the only way to know for sure is for me to dyno my car after i get the parts put on. That will be a while, but I'll post them on here when i can.