Opinions On My 89 Rx-7 Exhaust, Please!
 

I have an 89 rx-7 GXL n/a and its stock dual exhaust is missing the left muffler so i want to replace the exhaust with a little upgrade, i originally wanted the dual apexi N1 but i dont have $600, so then i was thinking this Cheap ebay 4" cat-back but 4" is just rediculous, rite?.. so now im thinking of just getting 2
3" - 3.5" mufflers from ebay something like this? http://cgi.ebay.com/ebaymotors/3-5-T...Q5fAccessories and then i want to put a test/race pipe or high flow cat to replace the cat, opinions? recomendations?

i think 4 inch might be a little excessive...especially for n/a. dual 3's would be a pretty cool setup and would probably sound good

if we can get some opinions from members or guests with an n/a and aftermarket exhaust that would be great, maybe even throw a video on here (or at least a link to youtube or something)

I can honestly tell you that you will hate yourself if you tried any exhaust larger then a 3" on a NA. A 2.5" exhaust will do you just fine, Really to go with a 3" I would say you would need a decent port job otherwise we are just talking about making noise. I don't know what other mods you have or plan to have in the near future, but that's my suggestion. Anything bigger is for the turbo cars & big port NA's.

I do agree with boosted as n/as do require some backpressure contrary to turbo, I wouldn't even consider 3"

I just noticed the link you had there. Wow they have N1 style mufflers for $10 with $20 shipping. You got to love the claims these Ebay product make. Now the N1 I looked at on there did have a 2.5" inlet, so if you wanted to try them out buy them & have a muffler shop fab up the rest of the system with 2.5" piping to a free flow cat or silencer. The 3.5" or 4" exit / tip is not going to be the deciding factor just the inlet sizing.

I'm 90% positive that Civic down the street had them...

I will never knock a product just because it's cheap, but I will question it's quality. I have came across a few guys running Ebay turbo manifolds with success & I know of a few guys that run high dollar manifold with tons of issues. I actually know a guy who ran an Ebay turbo, manifold & FMIC for 3 yrs @ a little over 330 to the wheels no problems. He sold all that and got a Garrett turbo & it lasted one summer @ around the same power.

I agree, but look at the construction! Besides, I'd look for ones that are chambered rather.

That also bring back memories of friends buying glasspack because it was cheap & loud.

LOL glasspacks, I had a set on a old truck.

Idk im thinking of those ebay mufflers a 3" and using a cherrybomb glasspack as a race pipe? I was thinking of just making my exhaust a single n forget about dual since single exhausts r a lot cheaper then dual... Idk

I would not use a glasspack on a rotary. Save your money & buy or have made a decent exhaust. It's okay to skimp here & there, but I would not suggest all out budget cut.

I guess i need to find a place around me (NY) that would do it how much do u think it would be? I found online 4 feet of muffler piping 2.25 for $30 and idk i was thinking if not ebay mufflers go to pep boys n get mufflers frok there cause they have brand name mufflers

If i run straigh pipes ill have clouds of smoke flying out the back of my car rite? Its better to buy a race/test pipe to replace the cat?

First and foremost, you should ck your local smog issues and many muffler places will not modify an existing cat set-ups due to legality issues.

Remember, you're running n/a and you need some sort of backpressure. My recommendation, especially if you're going to go single, is to go with a quality chambered muffler and skimp the rest a bit.

Don't forget that an uncorked NA rotary will be loud & annoying. That will definitely get you some unwanted attention.

Im not sure about going single i just mentioned it, im not worried about legallity stuff, but i was going to just put a 2& 1/4 or 2&1/2 whatever the stock piping is inlet racepipe with like a 3 inch in the middle and 2&1/4 or 2&1/5 outlit and replace the mufflers with stock piping inlit and 3 or 3.5 max inch tips

that would explain why mine sounds awful. theres no cat. and its n/a
hahaha im getting to it.

I want whatever performance upgrade i can get, a high flow cat will be too loud? Gut the cat? Drill holes in the cat?

Hollow 'em out. And get a good muffler system.

Im prob not gunna get a system, im not gunna waste 600$ or more for a nice exhaust its not gunna make a big enough difference to be worth it, im just gunna do whatever to the cat and replace the mufflers. how do u gut/hallow out a cat?

Rotary motors are not like your typical piston motor, a good exhaust system will yield decent amount of power for the cost. Remember a properly tuned exhaust will not only provide power but look & sound good as well. The company's that make rotary specific exhaust have done some of the guess work for you, thus the cost. Now on a highly modified car a custom exhaust designed specifically for your needs will source even more power. Another thing to think about there is always a trade off, more power will generally mean louder when talking about exhaust. Do not drill holes in the muffler or cat! If you want to try the gutted cat over a free flow cat, test pipe or pre-silencer that would be the choice, not drilling. You can take the cat off the car hit it with a torch then spray cold water in it. The change in temps should shatter the inside, make sure you clean all the debris. I still say go with at least a test pipe, they are cheap.

But wount a test pipe make it super loud & ricey? Or will the 3 inch mufflers make it a deeper tone? And id just weld the test pipe on, i have a 4 inch k&n cone filter intake also.

be redneck and fuck it up with hangers =]

Okay I'm going to make it simple. You have a "Naturally Aspirated" rotary once you alter the exhaust it's going to be louder. Gutted cat opens the exhaust a degree & increases sound. Drilling the cat is a joke & provides no performance benefits, just noise. Test pipe adds to the over all increased flow & yes will be louder. A pre silencer will help keep sound down while increasing power. Cheap mufflers have the tendency to not sound good & be loud as well add no gain in power. You could mess around & end up with less power then from the factory. When talking about muffler choice sizing is just one factor, there still material, construction & design. These are some things will affect over all sound & power production.

Alright, i just want it to sound nice ithink gutting the cat is gunna make it sound dumb, i guess im just gunna replace the mufflers, and btw i use to have a subaru legacy gt and it wouldnt start and my dad for some reason thought to drill the cat and then it started and everything was fine.... Idk why just throwing that out there lol

The reason for hollowing out older vehicles' cat is to unplug whatever trapped in its maze and allow it to breathe a little, unless you want to replace it.

But, like I said before I wouldn't skimp on mufflers if I don't have to.

Im not gunna get ebay mufflers, im jus gunna go to pep boys and find something since they have brand names, and as for the cat i wish i had more $ id get this: http://www.corksport.com/corksport-p...pipe-80mm.html