I forgot who said it, but after you kill your resonator and have an exhaust on, it gets louder. They forgot to mention the fact that it gets faster too. I originally had a stock exhaust with the stock resonator.

Then I got a Hayame exhaust and noticed more of a sound change rather than performance gain. Maybe got 3HP at most. Then today I killed the resonator, and a new pipe to replace it. I'm running with stock piping. Is this called a "custom cat-back exhaust" because it starts at the cat, then goes all the way back?

Well either way, it sounds crazy! My upper RPM's, around 4.5 - 6.5, really pull faster, and the whole powerband experienced a boost. When I hit 5 RPM's I even hear a hissing sound like I have a turbo boosting really low. Sounds awesome. Sounds like a racecar, but I know I have a long way to go before it will be one.

Question: Is 2.25" piping really necessary for our engines, because I already get a small amount of backfire, meaning that we don't need bigger piping from stock to let all the air get out. Someone was complaining about loud pops when they let off the gas, and I would blame the piping. Personally I would think that stock piping is fine for our cars. Even ROCK says so.

Please share some feedback.

--- Kei

My exhaust:

 

You have a hiss at high RPM's? That doesn't sound good. Could be the exhaust gasses getting dense enough that they're leaking out of a gasket somewhere and making a noise as they exit. That could could be why you're backfiring since the gasses aren't simply leaving out the tail pipe. As for this whole piping diameter issue, 2.5" is fine. I have the utmost respect for Tallini and the gang and have even talked on the phone with Rob for awhile but their philosophy is not the only one. Buschur who has as good of a name in the DSM field chose 2.5" piping and there have been no ill effects.

 

I backfire when shifting from redline with 2.5" piping for reference. I can't stress enough that it's not too much.

The resonator is really nothing but sound deadening. I think your car may just be adjusting to some other changes. i.e. temp, humidity etc.

 

So is there a difference if I stay with the stock piping at 2.25 than if I go with the 3.0 piping that is going to cost more? Will the sound be deeper? and will i get more horse power if I do it like visualkei? soryy for all the questions just want to know

 

For one, I'm doubting the stock piping being 2.5" inches. Next, if you follow your hypothesis, the wider I make my exhaust piping, the more power I get, and that is just plain wrong. 3" is way to wide. Only a high output turbo or a really big NA beast would need that much. 2.5" is the limit of how big you're gonna with bolt ons...as for "doing it like visual", he just removed a resonator. It's not really a bottleneck as much as something like a cat would be. It just deadens noise as Andrew said.

 

The hiss he's talking about is coming from his muffler. I don't know why some mufflers do it and some don't and I don't know why they do it. My Eclipse does the same thing.

 

Ok I know nothing about exhaust systems Anyway I heard some people in this thread saying that the stock 2002 lancer piping is ok anyway? and dosent need upgrading?

Ok So if you wanted a performance upgrade really the exhaust wouldn't be the major way to go? Or just a Muffler upgrade?

If I just replaced the muffler would that increase the performance?or just make it sound good?

Sorry for all the questions ... I'm thinking of starting to mod my car ... ( with little cost) if there is such a thing

Thanks Guys

 

The more exhaust you're creating the more you'll want to open up your exhaust. That's the bottom line. 2.5" is probably the biggest you're going to want to go unless you're running heavy boost. With just something like an intake it's absolutely not necessary to get wider exhaust piping, but it will not hurt either if you do not go too wide. The boost in performance would be very small, but every little bit counts, no? Simple answer, right? Hope that helps.

 

thanks that was a nice simple Answer so if I'm just going to put on an intake.. then the exhaust can stay stock... So what about a Muffler?? does that increase boost on it's own?

 

Ok, keep the word "boost" out of things. It implies forced induction a la turbo or supercharging. Mufflers are NOT major restrictors in most exhaust systems. Catalytic converters and narrow piping are the biggest and most common restrictors. The simple short answer: Changing mufflers will really only change the tone of your car, not the performance.

 

Just thought i would , let you all know that i have been running a 2.5" cat back system with no res..also with CAI from injen...gained 3hp at the wheels ...so if you want more TC X 6PSI = HP ..

 

3hp at the wheels from the exhaust only or 3hp in total? Lord that sounds depressing if it's the latter. Can't say I've been dynoed, but it certainly does'nt feel like just 3whp.

 

oh , sorry 3hp exhaust .. only total worked out to be 8hp .

 

If you have the test pipe, 2.25" piping, killed resonator, and an exhaust, expect about 8-12WHP. At least that's what I'd see soming out of that much of an exhaust-side of the equation.

--- Kei

 

Uhm...no. Those are VERY high numbers. Look at the Buschur results from Import Tuner and you'll see what I mean. A resonator will not wield very much if any but the cat will, but not THAT much.