I just got a ebay 2.5" test pipe(aka main cat-delete) and a ebay 2.5"inlet canister muffler. When I have all the dough, I want to do a custom exhaust system with just the one canister out the passenger side @ a slight angle. Would adding my test-pipe and gutting the two pre cats with this exhaust set up hurt my performance/drivability @ all?
Will I be able to shoot flames with the test-pipe inplace and kepping the two pre-cats?

 

okey i won't flame you for the ebay parts , but i think that would be pretty gay to have the exhaust exiting at an angle, the only reason ricers do that is cause there giant fart cans won't fit under the car otherwise.

if all your concerned about is shooting flames, forgot the test pipe and just gut all 3 cats.

 

Oh the muffler will deffinately fit., Its just this is my first RX7. I have had like five 240s and thats how I always did my exhaust was a canister @ a angle.

 

Apexi N1 and GT-Spec come at an angle to help the sound coming out of the car from bouncing off the ground and echoing making it louder.

Honestly, if you can still activate your aux port actuators, then any exhaust system you put on there will probably be better than stock. If you're cheap, ss auto chrome sells a copy of the corksport turbo back for $250, don't know anyone who has it but for that price why not try, not like it's gonna' kill or hurt anything on the car. You can have an exhaust shop mate your test pipe to the presilencer on it. Or you could get a header and have them retro fit that to the 3".

The stock manifold is a piece of ****, really.

 

I heard if your going for a flame shooter, stick with the stock manifold, and loose some (or all) of your cats.

 

Header flows better....... I don't have any idea why anyone you know would think that the stock manifold would help shoot flames better, but it doesn't.

If you really want to shoot flames, a header, Straight pipe, catback with canister muffler. Remove all emissions including the acv, dashpot, etc.

Just hit the rev limiter in neutral and let off, scares families and pets for hundreds of feet.

Plus you'll gain a chunk of power from the header. Even if you just get a paceshitter. The stock manifold, is like a bathtub, with a small drain on it.

If you have an S4 though, you'll have to either, wire the ports open, use the airpump to actuate them, use a serverely cost ineffective electric air pump and rpm switch to activate them, or take off the lim and remove the sleeves all together.

 

sound bouncing off the ground and making it louder?? i don't see how the angle would affect how loud it is. that sounds like some bullshit ricer crap marketing ploy.

i'm not attacking you, just saying that doesn't make alot of sense to me. if anything it would through the sound out the side and it would bounce off the center divider or traffic next to you and be even louder.

i just don't understand putting ricer crap on your car to make it look alittle better when the original stuff still functions better.

 

The car will be agonizingly loud. It will be fun for 10 minutes, but take my word for it when I say that after a day or two you will get VERY tired VERY quickly of setting off car alarms, giving old people heart attacks, and getting pulled over every 10 seconds.

In my opinion, NAs with a totally open exhaust sound like absolute garbage. At the very least you need a high quality resonator in there to trim off the chainsaw noise and bring the screaming sound down to a manageable level.

Also keep in mind that if you have an S4, you need to figure out a way to actuate the aux ports if you open up the exhaust. Using the air pump is common. Search.

 

hopefully you have better luck with your test pipe that you purchased off the bay. I bought one for $69 or so and it was complete garbage. The flange was bent and the pipe was at a weird angle that put the cat into the floor of the car. Once I got those problem fixed, this thing glowed like there was no tomorrow, I mean that thing really glowed.

I ended up taking it to a great exhaust shop and had them make a new downpipe out of a better quality stainless steel tubing.

 

I just had a test pipe put in by an exhaust/muffler shop.

My 7 is straight through from the manifold to the mufflers and it's not too loud. I don't have a radio or anything to drown it out either. HOWEVER, I would prefer to have something to quiet it down a bit.

 

Try putting a header on, you will know loud

 

I've done it before, and it's WAY too loud.
Have you put the test pipe on yet? Like Aaron said, your going to lose your 5th/6th port actuation if you don't have the back pressure from the cat.
My current setup is a rb header, rb presilencer, and GPE catback. It's just barely drive able on the street, borderline headaches.

 

What about if i use the test pipe, but keep the 2 pre-cats?

 

That seems pretty pointless.

Look at the diagram of the exhaust system in the Haynes or FSM. The main restrictions are all the cats and the stock exhaust manifold. You won't gain much but noise with a catback only. Replacing the cats will yield some gain. The real gains happen when you get rid of the highly restrictive exhaust manifold.

 

now everything I've read makes sense. I'll be leaving now. Have a good life.

the only advice I have is buy the Racing Beat true duals for best performance or buy earplugs. ta-ta.

 

i was just wondering, if you only gut the 3 cats, how much louder will your car sound from before you gutted it?

 

god wait till you see my exhaust set up 2 3/4" exhaust basically straight pipe with a resonator racing beat head an test pipe

 

^your new nickname will be ear-bleeder^^

I give you 2 months before you start trying to chop your ears off.

Anyone wanna get a pool going??

9/7/07

 

Just gut the first 2 precats and leave it alone!
You can still pass smog. Buying cheap **** gets you nothing in the long run.
Again, gut the first 2 cats then save your money for a quality header or exhaust.Rotaries run a lot hotter than piston engines!!!!