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From my research, equal length will give you a "smoother" sound since the exhaust pulses are all reaching the collectors at the same time. Unequal will make you sound like a bored-stroked camaro (think NHRA funny car).
I am not aware if Sikky makes equal-length, their page while full of verbiage doesnt really explain a lot of items including this one.
As far as gainz, I think they all over in the high 10s to low 20s, but then we get to the point of "is the ECU really retarding timing and if so, do you need a chip".
I totally agree with the notion that long tube headers are rumble friendly. While equal lengths are more to stock sound.
My V10 BMW M5 had long tube headers from Evosport, and that completely got rid of that notorious V10 sound.
I then replaced the long tubes with Equal lengths with primary cats deleted, and that made the car too raspy.
The best combo was high flow cat backs with equal length headers with high flow cats integrated into them. Perfect.
That's why I believe if any manufacturer can make these equal length headers and replace the stock cats with high flow ones, the car would sound perfect.
^^^^You speak like EL and LT headers are somehow different and not compatible. I have EL LT PPE headers on my ISF Do you perhaps men UL (unequal length)?
Equal length and "long tube" have no dependency relationship at all. There's a bunch of math that figures into designing a header and it's tempered by the available room to fit the header. You can have equal length short headers as easily as you can have equal length long tube headers. I hate stupid marketing terms like "long tube" that have no bearing on anything - either the tubing is the correct length for the powerband you want, or it isn't.
Greddy always made products that are not loud. So I ended up with Greddy, I love the sound. Also People say it’s cheap but it is still JDM and 1000 for axle back isn’t that cheap. I just wish it was a burnt tip.
Originally Posted by Autobacs
Ok. Back from the dead.
I am contemplating either a full exhaust or just an axle-back. Which one has the most restriction? The mid-section or the axle-back.
I also looking at the quietest, free-flow exhaust setup. I am primarily looking at eliminating flow restriction as much as possible while keeping loudness/drone to a minimum. I am not looking to impress at all with the sound but rather to minimize noise increase above stock.
^^^^You speak like EL and LT headers are somehow different and not compatible. I have EL LT PPE headers on my ISF Do you perhaps men UL (unequal length)?
Greddy always made products that are not loud. So I ended up with Greddy, I love the sound. Also People say it’s cheap but it is still JDM and 1000 for axle back isn’t that cheap. I just wish it was a burnt tip.
Are those the street versions? Are they the Supreme SP model?
Did you lose power when you installed the Greddy's? I just removed mine, they were crap!
The pipes are smaller in diameter than it's competitors and hence why the back pressure, they are designed to be used with a midpipe!
09-26-18, 08:58 AM
Do you perhaps men UL (unequal length)?
