Guys,i was wondering,has anyone bought that cat-back?




http://cgi.ebay.com/ebaymotors/ws/eB...m=140051566030

Is this an exact copy of the OEM cat-back (in terms of noise) or not?

Stathis

 

those bends look like total ****! it is pretty inexpensive, but expect it to show in the build quality.

nice car btw... SSM FTW!

 

If you want a replacement catback get a racing beat. Its better quality, won't be much louder, and you'll pick up a few hp.

 

Racing beat is much better quality. That catback does not look like it is worth the money.

 

I agree with the Racing Beat Quality RES, but no so much with the tone. I think a lot of you guys have been running A Spec exhusts and Apexi catbacks, that make your ears bleed, so you think the RB is quiet. But being that I have nly had stock, and RB, RB is WAY louder than stock. It is still the quietest aftermarket, but not even close to stock as for a being quit.

 

I have the RB DUAL for a year now together with HKS DP and METALLIT CAT.In terms of power the whole setup is awsome,but in terms of noise during cruise at 70-90 miles/hour i cannot stand it anymore.Maybe i am an old fart,but after one year i cannot stand it.I have added a magnaflow resonator after the CAT,but the benefits were minimal.I was thinking of installing a vacuum controlled butterfly after the CAT,but right now i don't have the time to do so.I am thinking of buying a stock cat-back, replace the 2 1/2 pipe with a 3 inch pipe and concider it done..

 

Exactly, I concur. Str8Down, you obviously still have you're hearing intact and can hear the differences that, for some reason, other enthusiasts are in denial about.

I had to add a 2nd resonator to my PFS to get it anyware near reasonably quite. It's acceptable, but barely; however, It is not like stock quite--which I often miss.

Expect similar results from the RB, or any other competent high-flow exhaust.

There are also plenty of good, used stock catbacks around if you want to go that route. I believe the 94-95 models were slightly redesigned to reduce backpressure.

 

I guess thats true when you consider the car makes like zero noise from the stock catback and sounds like a vacuum cleaner lol. I guess to the person that wants it absolutely quiet it might be a big change. I think for most it would be tolerable and pleasant.

 

Our experiences are similar. Although the magnaflow resonator I added ahead of the PFS cat-back made a big difference. I, too, have considered adding a butterfly inside the cat-back to be able to tune out the remaining drone for extended crusing; I still may do it. I have also considered getting a high-flow chambered muffer and mounting it on a v-band flange at its inlet so that I can quickly swap between it--quiet and the PFS high-flow. The better flowing chambered mufflers are 3" in and out have about half the restriction as the stock unit based on published flow rates. Note that the 2 1/2 vs. 3 inch pipe on the stock unit is really inconsequential as the primary restriction is in the muffler, so it's probably not worth changing it out. BTW, the stock muffler assy. ('93) has more restriction than a stock or HF cat.

 

The 20b cosmo was utilizing a vacumm + computer controlled butterfly.The system worked like this:In the low revs zone the two pipes(4 total) stayed open,while the other two were closed because of the butterfiles.In mid revs zone one butterfly opened so the exhaust gases were escaping from 3 pipes.And in high rev zone both butteflies were opened so all 4 pipes were flowing free.Now if we could find some close up pics of the cosmo exhaust and some technical data like the spring force of the actuator....

 

Interesting. They must of been going for that luxury ultra-quite thing on the Cosmo as that system seems quite involved.

I once gave thought to a simple arrangement using an old twin turbo WG or pre-spool actuator and using boost to control it.

You might want to check out some relavent info. I posted in my response to the following thread: https://www.rx7club.com/3rd-generation-specific-1993-2002-16/chambered-muffler-598086/

 

Here are some pics(thanks goes to frank -mazdafun-) :

 

Apexi makes a doo-dad called the ECV - Exhaust Control Valve. It's a butterfly valve you put in the exhaust. At its most basic, you just have a **** in the cockpit to physically open and close it.

But, they also have the DECS, which can electronically control the ECV. You can set RPM and load points up for varying percentages of opening.

I've seriously thought about getting this setup - if done well, you could have a VERY quiet car at idle and cruise, and let 'er rip at full throttle.

That said, if you want the hush quiet of the stock cat-back, you might just want to see if you can find someone selling a decent shape low-mileage stocker. There are some Japanese aftermarket cat-backs that are VERY quiet too. I have a Fujitsubo Legalis R in my attic that is INSANELY quiet - it also doesn't flow well and I lost a good chunk of power with it, but it's definitely whisper-quiet. I've had the gamut of exhausts on my car, from the RB dual tip to the HKS Hiper, so I've got a good point of reference .

Dale

 

I love my RB dual tip. Just had it put on yesterday. I think it sounds beautiful! Gives the car a throaty sound that was missing with my stock setup. To me it seems a hair louder but no more. Different strokes for different folks I guess. If quiet was the only thing I was interested in, I'd save some money and just install a cork. According to my mechanic that's about what the stock exhaust setup was. lol.

 

Dale,

I am aware of the apexi gadget.I had it in my hands last week.The quality is very good.A friend of mine bought it and will install it that week,so i will let you know how it works.He bought the simple version with the push button,not the one with the DECS .What troubles me is the fact that the apexi goes between the cat and the muffler,while all the other OEM butterflies are installed to the exhaust tips(ferrari,porsche,corvette etc),and even the 20b cosmo.A small observation: with the RB duals at steady 90 miles/hour cruise EGTS were in the 680C region.With the stock cat-back EGTS went to 750C!!!(because of the backpressure).

 

That is good info! I'm not a mechanic but it seems to me that the whole principle of better cooling is affected positively when you can get the air cooler going in (cold air box intake) and get the hot stuff out quicker (less restrictive exhaust system). No rocket science there I guess.

 

anybody check out the Tanabe exhaust systems? i heard the medalion touring was pretty good. my friend has a Concept G from Tanabe. @#%'in sweet. :]