IT IS WONDERFUL! i cannot hear my car at all! it is soo quiet. before i just had a straight midpipe. i couldn't drive anywhere without waking up everybody within a square mile of me. this is a wonderful product!

my mods that matter for this topic:

pineapple large street port
gt35/40
greddy power extreme
now: resonated midpipe

 

Thats awesome. I am really considering one myself. My friend said he could here me getting on it about a mile from his house when he was on his front porch. I thought he was kidding until I heard my car for myself on the dyno yesterday.

 

I had the same experience last week, when I installed a Kakimoto resonated midpipe. The car is noticeably quieter when I want to simply cruise, and it opens up nicely on WOT runs! I defintely would recommend this over a non-resonated one; unless, of course, you don't mind going deaf along with anyone else within 1/2 mile radius

 

I plan to run a stret ported motor with stock twins an hks 72mm downpipe intake and a nurspec 80mm exhuast with just 3 inch pipe connecting the downpipe to the exhaust will this cause me any problems other than higher boost leves, and the noisepollution!!!

I do not mind the temporary noise level even tough the cops won't liek the 17 year olds loud red rx7, but am more worried about to much flow and no backpreasure!
need some tech support help me out!

thanks, joe

 

If you're looking for more help, here's a few suggestions:

Don't go with the HKS downpipe. The first bend, proximal to the turbines is flat for compatibility with Japanese right drive cars with the steering columns running through the same space. The regular 3" downpipes made here in the states are much better, made with Stainless instead of Mild steel, and a full 3" all the way through. If you're looking at the HKS and the Blitz, it would seem like you're just trying to buy the cheapest parts out there. I can't say anything about the Blitz. I paid $329 for my HKS Hiper from the RX-7 Store and I'm very very satisfied with it. Can't beat the quality and performance of HKS any day. A friend of mine paid an extra $200+ for his JIC that everyone was so full of talk about and it wasn't near the level of quality that the HKS came with. Fittiment was also a problem. You will be fine on the stock ecu with just a downpipe and catback, but I wouldn't recommend adding an intake on top of that until you have either a remap, pop-off valve, boost controller, or wastegate pills. A midpipe will eliminate your main cat and require a real ecu remap to compensate for the additional fuel or you will pop your engine. Although you may be concerned with backpressure, I can assure you that you will begin to like the full open exhaust benefits while having a turbo car. Remember that the only thing that prevents the turbines from spooling up is the restriction in their exhaust path. You will gain massive amounts of power opening up the exhaust in your RX-7, whereas many non-turbo cars will actually lose power because their engines and ecus are not tuned to be compatible with a higher exhaust profile ramping. If I were you, I'd go with a nice stainless downpipe and catback. Don't go with the HKS dp because it doesn't do its job as well as the other ones out there. Look at M2, Pettit, or whatever other 3" parts there are for sale. Pick whatever catback you think you can trust. Enjoy the sound and be ready to buy a new clutch if your's is still stock because you will start to slip at WOT after doing those exhaust pieces. Then start researching ECU options before adding an intake and midpipe.

 

I need a resonated midpipe now that I've been forced to disconnect my airpump. Any suggestions? I'm after a good throaty sound, tending toward the quieter side, while still being straight-through enough for the occasional flame...

 

I have a center force dual friction and have only put 1000 miles of casual drivin on it! I have also lowered my car with tokico 5 way ajustable struts and entrax springs(-1.75)! I am also running a nurspec exhuast ( 80mm exit I think) with three inch straight pipe runnig to a fully stock motor and downpipe. I thought that since my motor and turbos are both being rebuilt I would do the intake and exhaust up grades at the same time and watch my boost guage to make sure that I do not overboost or kill the motor while still in breakin period (full 1500 miles)! while breaking in my motor i will save the exrta money to buy a computer and more efficient front mount intercooler.

I do not plan on installing a midpipe! I am going to run my downpipe (????????? dont know what to get) and the nurspec exhaust will this cause me to run rich during breakin.

thanks, joe

 

I am building with a 17 year olds budget and only had the car 1/2 year or so! But I want to it right! I do not think the more improved airflow will hurt me even though it alowes te turbos to put out mpore boost because i will not be driving hard for a while (1500 miles) My end goal is 15 psi with 2 peice 2mm seals every day of the week!

thanks joe

 

stock turbos won't last too long running 15psi everyday, maybe you should back down to a more reasonable 12-13psi, or call up BNR and upgrade your stockers

 

whats a resonated mp, if you dont mind me asking...?

 

Theres a muffler on the midpipe to reduce the noise levels.

 

I plan on running 15lbs on my stockers all the time. On pump. Ill be going with stage 3's probaly though, they have the sexiest power curve ever! Then Ill be at 18lbs =]

Josh

 

muffler? so you weld a muffler in place of the mp!! hmm... doesnt that put more backpressure then? and cause less hp?

 

The resonated MP is a straight through design which doesn't add much back pressure. It's not even noticeable. Since it is straight through, it doesn't do a very good job at muffling. The car is a little quieter while idling and cruising, but once you step on the throttle it's just as loud as a standard midpipe.

 

Pettit resonated mp...3" SS nice piece of metal.

I run HKS dp, resonated mp, and HKS carbon hyper...great low grumble at idle and street, sounds like wicked beast at WOT (who cares never anywhere long enough at WOT to be a nuisance for too long!)

 

Hey Mikey,
Noticed you are from Oklahoma...Not too sure how far that is from Tulsa but there are a about 5 FD guys and a couple FC guys trying to organize a meet here in Tulsa...If you are interested you can sign up at www.TulsaTurbo.com

Later

 

Silver7: tanx dude... i might take a look at that... my car is loud with a HKS dp and HKS supper dragger... Its annoying during highway cruise...

 

I run the borla XR1 sportmans on my midpipe and it's QUIET. Sounds better too.

 

A resonator is somewhat different than a muffler. It has the same functional purpose, but its used for different applications. Mufflers use internal walls to bounce sound around, but often cause additional back pressure due to the lack of straight through designing. If you're confused for what "straight through" is referring to, its the exhaust where there is no obstruction through the exhaust gas flow region and the sound reducers are external to the circumference of the flow cross section. Basically, its like a motorcycle exhaust. N1, Hiper, JIC, PE, etc...they're all straight through design. Resonators are actually derived from 2-stroke motorcycles. They are the belly-looking thing in the bottom part of the exhaust piping that looks like a stomach. The piping is still straight through, but the curves in the bulge allow for sound to bounce around, or resonate inside of the chamber and reduce itself before coming out. That doesn't exactly mean that 2-strokes are really quiet, but it reduces the noise and makes a much more significant reduction on car applications.

 

I also have the Pettit Resonated Midpipe. Great power adder ... probably the best one next to the IC. With the resonator, the car is very quiet at idle and during primary turbo operation. Once you get near transition or past it, it gets real loud. Not quite as loud as a straight midpipe, but very audible. I've grown to like it though ... the resonator gives it a mellow, less-high-pitched ring to the exhaust note.

 

I've had a very reliable source tell me that the resonator/welded muffler MUST be steel mesh and NOT fiberglass or else it will melt out and become just a regular midpipe, so don't go cheap. Most of the universal mufflers have fiberglass crap in them that cannot withstand the heat of a turbo rotary
Just a FYI if anyone didn't already know

 

Do you guys know if there's any difference in the Pettit and SR resonated midpipes? Did a search and didn't see any real comparison of the two. SR's is $20 cheaper, but doesn't mention anything about it being ceramic filler. Surely they wouldn't sell anything with fiberglass in there. I assume they're probably selling the same thing.

Call me a ricer all you want, but being the pyromaniac that I am, when I go midpipe, I want some flames.......I KNOW the Pettit one is conducive to this, I assume the SR version is also?

Thanks!