Ebay Y pipe reviewed and dyno'd
 

Got my $99 ebay Y pipe installed and dyno'd today.

I tried taking some pics on my phone, but they didn't show up later when I tried to load them on my computer, not sure what happened with that. Anyways, the pipe is one of these:
http://i.imgur.com/P8AQ8.jpg

Ebay Y Pipe Weight 10.41 Lbs
Stock Y pipe Weight 14.51 Lbs

Dyno runs were done same day, a couple hours apart, 3 before runs and 3 after runs are shown. The car had a tune on it before the Y pipe was installed, and the tune was re-tweaked a bit after install. So runs are comparing tuned vs tuned.

Only other mod currently is PPE Longtube headers. Exhaust after Y pipe is still stock.

http://i.imgur.com/Kv1Iz.png
How it sounds:
With just PPE headers and stock exhaust, there was an annoying rasp starting at 2300 RPM, even at very light throttle. This was annoying to me because it made my car sound obnoxious even when I was trying to drive conservatively, just putting around between stop lights, etc.

With the new pipe, it seems the rasp doesn't start until 3000RPM, and only when giving more than maybe 20% throttle. So if I'm cruising and accelerating lightly, I don't get the rasp like before, it's more controllable. At WOT it is a bit louder than with the stock Y pipe, but not a whole lot.

Overall I am pleased with this purchase. Can't go wrong for $99 shipped.

thank you! awesome gains for $100.

Whats with all the weird drop offs in TQ at around 3-3.5k rpms? :ugh2:


What's the ID of the new Y-Pipe?

The PPE headers do rasp a lot. The XYZ Y pipe with cat helped with it My setup rasps in the mornings, but after the cat is warmed up, it isn't discernible anymore. Then again, your Y pipe was %$400+ cheaper.

I've thinking to order this Y pipe for a good time now, it definetly goes into my list of most performance for your buck modifications. 50hp for under $2,000 (tune incl.) sounds good?

Where are you getting 50hp from a Y-Pipe from? :ugh2:

Woops, after a second look i think the rpm axis index labeling got cut off on that image. If you look at where the torque and rpm cross (5252 rpm), then you can count the bars from there. Really it looks like some power is lost below 2700RPM, which isn't that big of a deal in my opinion. If you are trying to go fast, racing or whatever, then you be above 2700 RPM 99% of the time anyway.

Oh if you mean the other blips on the torque(which actually show as gaps in the power graph), I think the inductive ignition pickup was getting some interference or bad reading, but if you look at the rest of the graph it's pretty clear where the curve really is.

The pipe is 2.5" to 3".

Yeah, that's what I was referring to. Yeah I'm not doubting it, it's pretty flat. :tup: Good gains.


The 2.5 to 3" is good, but now you just need to drop off the rest of the stock pipe cause you're choking up all that free flow you've gained from the headers/Y-Pipe. :(

Yeah I'm definitely planning on replacing the rest of the exhaust eventually. The idea right now is a custom single 3" pipe from the Y back. One step at a time... Hopefully with the right muffler/resonator combo it won't be too insanely loud.

Probably something very similar to TypeOne's custom exhaust

Overall with this car I'm trying to keep a very lightweight theme. Single exhaust should save a few pounds and single 3" will give plenty of flow.

I like the idea/look of the single exhaust. It just looks weird with our bumpers having the dual tip cutouts. That's the only downside.

Have you looked at, I believe Amuse makes a single exit exhaust for us? (I know you're looking for low cost, but just for an idea on piping/routing.)

Yeah I've seen that, "Amuse R1000" titanium single exhaust. Ridiculous price, something like $3K or whatever. Will definitely take that design into account, but really there's only so many ways to route a single exhaust. I'm actually toying with the idea of aluminum exhaust. Vibrant makes some all aluminum mufflers which could be used.

The only thing that makes me cautious of doing that is that I think the lightweight material could make the tone more raspy/ricy sounding.

It will probably carry a lot more volume with it too. Just due to the thinner metal.

Whichever you choose, just be sure to get 18" resonators if you want to reduce rasp. Most setups are fairly quiet at steady speeds and idle (cold starts are an exception). It's when the car is accelerating where it can get loud. I have a Tanabe exhaust and it's considered quet... not so much anymore with the PPE's and HFC

I still believe that after the stock cats, the Y pipe is the next most restrictive part of the stock exhaust. I saw great gains with my Tanabe Y pipe, and it looks like you got some nice gains too!

These are interesting gains. Nice gains but can it be? The tune itself could give up to 20 hp if I'm not mistaken. I just ordered one for the hell of it.