Exhaust diameter
Thread Starter
Race Director
Joined: Jul 2007
Posts: 11,467
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From: 972 and 405
Exhaust diameter
I've been window shopping for performance exhaust on websites here and there and I have noticed that alot of the offerings come in 2.5inches... 2.5 INCHES!?! Seriously, isn't that the stock size? I figure with a better routing that may provide some minimal gain, but isn't the point of a performance exhaust to release more back pressure? So obviously that would come from a larger size pipe. So what brand should I look towards for actual benefits? Also I am looking for twin tip exhaust, not the four tip.
-Alex
-Alex
Pro
Joined: Dec 2005
Posts: 619
Likes: 2
From: Destin FL
Reducing backpressure is accomplished by decreasing the resistance AT the maximum volume flow of the flowing gas. As long as the pipe size is already sufficiently large enough to minimum restriction at the volume flow at WOT, then using a bigger pipe just adds weight, but doesn't necessarily reduce the resistance. The majority of the resistance we all would like to get rid of occurs in the muffler itself. That's why all the systems that claim the highest horsepower gains have very small (or no) mufflers.
However, having said this, I just saw a post on here yesterday or the day before where one the supporting vendors is now offering a full length 3" diameter system from header to tip (LG, I think - someone correct me if I'm mistaken); beautiful SS pieces too.
However, having said this, I just saw a post on here yesterday or the day before where one the supporting vendors is now offering a full length 3" diameter system from header to tip (LG, I think - someone correct me if I'm mistaken); beautiful SS pieces too.
Le Mans Master
Joined: Sep 2007
Posts: 7,604
Likes: 8
From: Belleville Il
I've been window shopping for performance exhaust on websites here and there and I have noticed that alot of the offerings come in 2.5inches... 2.5 INCHES!?! Seriously, isn't that the stock size? I figure with a better routing that may provide some minimal gain, but isn't the point of a performance exhaust to release more back pressure? So obviously that would come from a larger size pipe. So what brand should I look towards for actual benefits? Also I am looking for twin tip exhaust, not the four tip.
-Alex
-Alex
