Prius Exhaust Mods?

I wonder what it would sound like if you just cut the exhaust pipe off 2 feet just after the bend and then welded on a stinger pipe like the old VW BAJA Bugs? That would wake you up when the engine kicks on.

 

One of us does NOT understand the difference between an Otto cycle engine (exhaust is still expanding past the cylinder) and the Atkinson cycle engine (expansion stroke is 30 larger than compression stoke, so exhaust is close to atmospheric pressure) used in the Prius. You are not going to find 10 HP, perhaps 1 HP, but mostly just nasty 4 cylinder noise to annoy everyone else with. If you want HP, turbo/superchargers will have some effect, but not the effect you expect, I bet. (the batteries remain charged longer)

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I hate it when people say this. The truth is auto manufactures do not always do things in the best interest of the customer. They do what's cheapest, that meets the basic needs and minimal wants of the customer in order to maximize profit. If this argument were true, then all Ford Mustangs which should be designed for speed and power would come stock with Eibach suspension, K&N Cold-Air Intakes, high-performance headers with an x-pipe, and FlowMaster exhaust systems.

Why do people have to criticize others for wanting to modify their Prius? This is the modification section of the web-forum! I'll mod mine, and you can keep yours stock and we'll both be happy!

But don’t put others down for trying something new, or wanting to be different.

 

Instead they come with driveshafts that shatter: Watch what happens when a Ford Mustang driveshaft fails at 135 mph

Why do 2011 Ford Mustang driveshafts keep exploding?

 

I'm glad I've given up on any American made car. I can't believe Ford wouldn't design a better driveshaft, but then again if they fail at 120+ mph, in order to reach that speed the speed limiter has to be disabled, thus voiding the warranty, so Ford is no way responsible for building a flawed product... (aka a crap product) When I win the lottery and have the money to blow on a high-performance car, I'm getting a Porsche. American made car's suck!

But going back to my point, even Porsches have after market parts to boost performance. Why criticise others for wanting more power or control. Just because it's a Prius, doesn't mean it can't be improved or modified.

 

Just straight pipe it!:rockon::rockon::rockon:

DBCassidy

 

Who says you can only choose one or the other?

 

Like sayin Ford auto exc and engineers would have made stock shelby vehicles

 

Check out this link to the Tanabe exhaust:


Tanabe USA R&D Blog | Toyota Prius (2009)

 

this is mine:
Sorry bros, finally, I installed ! | PriusChat
SilkBlaze rear spoiler & Premium sound muffler set done | PriusChat

the sound reference (taken by iPhone, so, the sound may not be so good):

 

I did on my 2008, cut it off before the gas tank and removed the 2nd cat. All it had was upstream cat and resonator.

PC36100 ? 2

 

did it give any more power or just get loud? any pix?

 

That looks awesome! I wish the Prius came that way stock. where did you get the exhaust and what shop installed it?

 

Pics and why you did it would be nice


iPad ? HD

 

Hate to revive, but didn't really want to start a new thread...

Why has no one just done a header install from the Yaris?

Yaris OEM header

G2 Prius Header

DC 4-1 long tube header for 1NZ-FE 1.5

TRD Header for 1NZ-FE 1.5

Megan Header for 1NZ-FE 1.5

Also for the remainder of the Exhaust system:

Yaris MidPipe and Resonator: 17410-21541
:

G2 Prius MidPipe and Resonator: 17410-21500:



I would probably do a something similar to the Nitto Mid-pipe (No Cats):


or if I wanted to stay CA legal... Create something custom like this with Cats:


and a custom 2" cat back...with (2) Magnaflow mufflers (one to simulate the oem resonator)

and tips kinda like below:

Magnaflow #35168


$250 - DC 4-1 header
?? - Mid-pipe...
$188 - Magnaflow #14714 (2@$94ea)
$60 - Magnaflow #35168

$500 so far plus labor and material

 

Hah.. found a picture of the undercarriage of the Prius.. Gives me a better idea of the bends needed to complete this custom exhaust.

 

ok so those aftermarket headers are for the yaris? it looks like the yaris manifold and the prius manifold are almost the same; only in the pix one is upside down. i think the choke point isn't the manifold, as you see from that poor car some twit flipped into a ditch, the pipe after the 2nd cat is way too thin, and from there on back its just as thin. if someone was to make a pipe from the 2nd cat back, (it'd have to be welded on) that might free up a little power. its got to be making more back pressure than you'd ever want. i think toyota wanted the cars to be very quiet, and didn't expect prius owners to actually want to drive the car. what is that 3rd cat? is it just a resonator or is it actually part of the catalyst system?

 

Here's a better comparison shot:
1 is Yaris - 2 is G2 Prius both use the 1NZ 1.5, just one is the 1NZ-FE and the other 1NZ-FXE

The Picture angles aren't perfect...but from what I can tell - Everything including the bolts and o2 sensor bung are all in the same location.

Yaris: 17141-21130 .....................Prius: 17141-21120


But, why 2 cats, i have no idea. I thought maybe this was a CA car with the extra restrictions, but from what I can tell, all G2 Pri have 2 cats. I don't exactly know what the diff is between a Cali CAT midpipe and the other 49states. 'Cept a couple of nitwits.. I would guess resonator in the middle of the exhaust...just has one from what I can tell on other cars i have modded the exhaust on, usually you will find a resonator just about the middle of the car (just like the picture of the 'twit-flipped-prius" lol)..then more piping then muffler. Because the Magnaflow muffler is a straight thru design, I could use two of them. This would most likely keep the noise down, but it would be a lil louder than stock. I am def NOT a fan of the muffler resonating loudly as I drive down the freeway at highway speeds. My civic did that, but then I was a lot younger bk then and I had also removed the cats. Cars aren't smogged in KS.

I may just start with the header swap then just cut off from behind the 2nd cat and weld the Magnaflow #14714 muffler/resonator, some 2" mandrel bent SS piping, the 2nd #14714 running out to the #35168 Tips.

 

No smog? Then don't p*ssy out. Skip the headers and muffler and put them pipes right through the hood!

 

Hah! "We're Not in KS anymore..Toto." The lil Prius would most likely lose 2 much back-pressure with straight pipes peeking out the hood and run like crud...Besides that def wouldn't pass smog here in California...beside being way too loud for daily driving.