does anybody know what size the stock exhaust piping is from 2nd cat to muffler.......

 

2" i believe.

 

To quote Ed MacMahon, "YOU ARE CORRECT, SIR! HAHAHAHAHA!"

 

Amazing the difference a quarter or half of an inch will make, eh?

 

eh is correct i have a 2.5 and well lets just say it got louder and faster

 

I would think two and a quarter inch would be plenty big for a N/A Lancer. Two and a half inch will get a turbo DSM into the 11's. I doubt you'd want to go above that without F/I on a Lancer, because you'd probably lose too much low end torque without any significant gain, and possibly a loss.

 

I think we are discounting the fact that you ditch that stock resonator, where I'm sure tons of noise was lost, and unnecessary backpressure made.

My thoughts exactly. I went with the "conservative" 2.25" with my catback, went with my muffler,

 

ok sweet i believe here soon im gonna get the buschur 2.5 catback exhaust just wanted to know how much bigger i was gonna go....... thanx all

 

Nooooope. Import Tuner dyno'd the exhaust and voila, nothing but gains. Small gains...couple of HP and lb/ft, but gains none the less.

 

At the risk of looking like a tard... and being rather wrong... I want to say that the exhaust is actually 1 7/8" (internal diameter). Sadly I can't quote my source on that...

On the other side of it... assuming that the 2" exhaust is correct... going to 2.25" exhaust is actually a 27 percent increase in volume (the area increases by 27% and the length is constant yada yada) so you can semi figure that the resistance encountered by the engine drops by something within probably plus or minus 10% of that...

I'm in the process of sorting out a nifty exhaust system... which I'll post sound clips and pics of once I settle on it and have it installed.

 

2"
my aftermarket muffler TIP= 4"

 

It's 2", but I remember reading that the internal diameter is 1 7/8". I wanted to know if anyone has gotten the greddy exhaust yet and if it was too loud. I want good tone, but I don't want it to create too much road noise.

 

I guess unless you are trying to fit parts to the current exhaust the size really doesn't matter. It is generally agreed (with dissenters though of course) that 2.25" is the way to go...

EDIT: (Hobie points out below this that there are no number to go either way as of right now.. which is a really good point. My brothers and I who all do a little car tuning tend toward the 2.25" for an engine like the Lancer's... but that is probably at least somewhat subjective)

One thing I learned though as i see the last post has regards to the Greddy exhaust... I was looking at going that way as well... I'm now getting a custom job done by a really good small exhaust shop in my area. They are putting in a straight through resonator, as well as the muffler, and all 2.25" piping cat back and doing it for under 300.

After spending about two weeks researching this to death... I'm pretty much settled that custom is the way to go... if you have concerns about the bolt on bolt off... the shops will put on flanges at your request.

If you want Greddy... buy a Greddy muffler and get the rest custom done would be my recommendation! I'll start a thread at the risk of pissing off a moderator once I have a sound clip of my system (all MagnaFlow by the way). Private message me if you want me to alert you as soon as I have that available!

(Exhaust goes on tomorrow - 3/27/03)

 

Show me a dyno result with a 2.25" and I'll consider recanting. Until then I stick by Buschur Racing and Import Tuner's across the board gains on 2.5" and reiterate that I have had NO noticable loss of low or mid torque with my 2.5" mandrel bent exhaust. I think you'll find everyone else with one will say the same.

EDIT: The only reason I get irritated when people say 2.25" is the way to go is because they almost ALWAYS claim losses on the 2.5" which has been shown to be UNTRUE and NO ONE has provided any results on a 2.25" exhaust. This isn't to talk **** about 2.25" exhausts, but ,for the love of God, we can't just ignore the numbers.

EDIT EDIT: Yeah, custom is definitely the most cost-effective way to go though. I agree wholeheartedly there. I didn't mind paying a little extra to do a little more hands-on though.

 

I'd love to show you dyno results but there isn't any Dyno within 50 miles of where I live which pretty well bites...

My guess as far as it would go between 2.25 and 2.5 is that they just have different shaped horsepower and torque curves... I'd guess that you get more in the high end on a 2.5 because of the increased flow through but the POSSIBLE (can you really feel one or two horspower/ft-lbs?) "losses" that everyone claims in the low end. But just like you very acurately pointed out Hobie... Unless we have numbers its pretty much all guess work and laying certainty on either size is kind of an exercise in arguing with no support.

There are exhaust sizing charts out there though based on displacement and horsepower that lay claim to both sides of the story recommending antyhing from 2" to 2.5" for a car like ours... Gotta love the "exact" science of things