Home- made EXHAUST SYSTEM ideas??? (no muffler, no cats)

[morpheus1]

Anyone ever made a home- made exhaust system that eliminates some/ most stock resistance from the stock setup?
Im really trying to keep it cheap and more of a project than buying a rather expensive exaust?

Something like a 3" pipe of some kind of matierial straight back with no cat or muffler, what could i use to connect something like that to the downpipe?

Any ideas from what any of you guys have done?/ seen done?

 

[mazzer]

exhaust ... vacuum ???

obviously you'd use a flange to attach pipe to stock downpipe

take it to a reputable local speed shop and have them make you one. there are very few bends and it should be significantly cheaper than buying a $600 cat back. i know shops around my area are hurting for business , because no one wants to spend any money


on another note, i hope this isn't a DD. this car will be VERY loud with a straight pipe

 

[Rennat]

i've heard a car with a straight pipe... and its not THAT loud... but he never got on it, its all about how you drive the car...

but yeah, a local muffler shop should be able to handle it no problem. if not there is a "diy kit" offered from 935motorsports.com
its like $150 for the pipes from the downpipe back... which is a pretty nice deal considering its pre-bent... and then if you dont want a muffler just put an extra piece of pipe over it, or maybe a shiny tip...

just hope you never get pulled over....

 

[supradjza80]

I run a straight pipe and the car is quieter than most NA cars with catback systems.

 

[Poodles]

Still too loud for a street car. Not to mention being completely illegal and inconsiderate of other people on the road.

 

[Wills7MGTE]

Inconsideration is all a matter of perspective and its no worse than the fart can clad neons, civics, cavaliers, and mazda protege's. If you're going the straight pipe no muffle route why not save time and money and have someone bend a pipe to let out right behind the right front tire, tons of power, cheaper and easier.

LOL

 

[easternguy2005]

W/o a resonator and some muffler you'll take the luxury component out I think.

 

[supradjza80]

becuase having the straight pipe exit behind the rear tires makes it extremely loud in the car.

like I said my car is quieter than just about any NA car I have seen with a nice catback exhaust system. It doesn't drone, its not even loud in the car on the highway. It is a 2.5" straight pipe from the DP back.

 

[jgcable]

what about backpressure

 

[Rennat]

what about it?....

on a turbo car you want at least a 3''...
on an n/a car the 2.5'' is a good 'street' exhaust...
but if your n/a and you go to the drag strip you might benefit form a 3''...

 

[Poodles]

Search for backpressure on these forums, I'm getting sick of explaining it...

Straight pipe is for only two reasons (same reasons for not running a cat):
-racing (leaded gas will destroy a cat)
-being cheap

You answered your own comment, why would you want to be associated with the idiot ricers?

 

[deabionni]

what about backpressure

1. Search this forum. Back pressure isn't necessary.

2. Even if it was necessary, don't you think that big ass thing hanging off the manifold would provide plenty of it?

 

[morpheus1]

what about it?....

on a turbo car you want at least a 3''...
on an n/a car the 2.5'' is a good 'street' exhaust...
but if your n/a and you go to the drag strip you might benefit form a 3''...

Is the flange fit to the stock downpipe a 2.5" connection?
im going to keep the stock turbo elbow and the stock downpipe, so could i find a 2.5" flange that turns into a 3" pipe all the way back after that?

 

[morpheus1]

Inconsideration is all a matter of perspective and its no worse than the fart can clad neons, civics, cavaliers, and mazda protege's. If you're going the straight pipe no muffle route why not save time and money and have someone bend a pipe to let out right behind the right front tire, tons of power, cheaper and easier.

LOL

well, a drag pipe out of the side might get me pulled over quickly ( i live in a big city) i wanna run a straight that won't be (too) loud

 

[BlackDevilSupra]

.... i wanna run a straight that won't be (too) loud

This is an oxymoron, and just about as equivalent to advertising a huge banner on you car saying "Please Pull Me Over".
As strict as the state of CA is in respect to emission devices, I don't think it's a rather wise decision to operate a vehicle that lacks these devices.
MHO..

 

[figgie]

what about backpressure

oh dear god not here also.......

talk about an oxymoron......

**The Department of Redundancy Department**

The next person that says "Back" pressure will get a fluid dynamics crash course from yours truely! :rant2: :madfawk:

Who ever cobbled that word into something that is supposed to be meaningful should be shot on the spot.

 

[foreverpsycotic]

When my car was na with an open downpipe, way too loud, when it was open downpipe on stock twins (1jz) it wasn't that loud. Ill let you know what it sounds like with a single.

 

[Keros]

In short, backpressure in the exhaust is a heaping pile of bullshit.

If you're running the car on the street, put a REAL exhaust system on it that meets the legal requirements to be insured and tagged in your area.

If I heard a MkIII Supra rip out my ear drums just by accellerating from a stop light, I would go home and sell mine in order to avoid being associated with that douchebaggery. Is it really neccessary to make that much noise to get to 20km/hr? I've seen (heard) civics, tiberons, neons, sunfires, and alot of other rice, that are louder at idle than my 7M is at WOT... wtf? Get a real muffler assmunch.

Let me translate the sound of a fartcan/lack of muffler, pulling away at a stop light, for you:

IIIIIIIIIIIIIIIMMMMMMMMMMMMMMGGGGAAAAAAAAAAAAYYYYYYYYYYYYYYYYYYYYY

If it's a track only car, by all means bang away without any exhaust. If you're going to street it, do us all a favour and get a real exhaust system.

/rant

 

[figgie]

In short, backpressure.....

In short "back" pressure does not exist. Does anyone here care to take ONE guess as to what Fluid dynamics calls the resistance to flow in a system?



On a related note. Riddle me this batman, what is "back" resistance in an electrical circuit? No, Not back inductance or back current. Back resistance (JetJock, no spoiling the party!)

 

[Keros]

Calm down Figgie, just calm down man. It'll be ok. I know enough fluid dynamics that the guy who coined the word back pressure needs to be curb stomped.

It's ok dude... pressure is defined as resistance to flow... no one needs to die, put down the intellectual beat stick!

I was merely pointing out that the whole "exhaust backpressure" thing is archiac thinking and complete BS. As for back resistance, I'm afraid I don't know enough about electronics to even begin to play games like that with you, figgie. I know several electricians... I call them when I have electrical issues, so that I don't fuck it up worse.

Sometimes I wonder if you lose sleep over SM threads like this. Staring at the ceiling saying "WHY CAN'T THEY JUST UNDERSTAND!"

I think this thread is discussing the merits of running straight pipe exhaust, rather than the idiocracy of "exhaust backpressure"