ZZP Mid-length Combo and Vibrant Exhaust
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From: Fayetteville/Linden, NC/Myrtle Beach, SC
I know there are even some members on here that have 2.2L turbo with 2.5"
Dude it's all preference. Honestly. 3" gives room for expansion (as Tom would say), but then again he makes the most power N/A on this site.. But everyone else runs 2.5".. Hell, some people argue that 2.25" is better than 2.5".
It depends on the build. And everyone's is different, therefore no one is going to have the same answer, and if they do, it won't be for the same reason.
Dude it's all preference. Honestly. 3" gives room for expansion (as Tom would say), but then again he makes the most power N/A on this site.. But everyone else runs 2.5".. Hell, some people argue that 2.25" is better than 2.5".
It depends on the build. And everyone's is different, therefore no one is going to have the same answer, and if they do, it won't be for the same reason.
Quoted from there:
Pipe diameter does have an effect on flow rates as well, but again it is not the major factor in most cases. 2.5" may flow enough for 300-350 h.p. without being a restriction. 3" is usually capable of flowing 500-600 h.p. before becoming a restriction. This is assuming that you have designed the rest of the system up to par. There are also full 3.5" systems and those that start out at 4" and taper down. Unless you are making over 500-600 h.p. anything over 3" is a case of diminishing returns and in most cases has no advantage. There is more to gain going from 2.5" up to 3" than there is going from 3" to 3.5". A 3" system will not loose torque compared to a 2.5" system if designed properly. In fact if designed properly 3" may be capable of making better low end torque than 2.5". Again, since the way to make the most torque with a turbo exhaust is to get the turbo to spool-up as quickly as possible, it should be the main goal of the entire exhaust system and good flow after the turbo is one way to achieve it. We use 3" as we want our system to flow enough to be capable of coping with a customer's changing goals. Properly designed we can offer it to the big power crowd while still appeasing the low end torque club.
On a turbo car, sure.. I just see no point in going 3" when you're making under 250WHP. Honestly, you're making a **** ton of noise for a whole lot of nothing. There is a reason 99.9% of exhaust companies recommend 2.5" for our motors.
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Joined: 12-05-09
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From: Houston, Texas
Exhaust companies have to maximize horsepower while keepiing sound in check, making sure it doesn't rattle, fit and finish is like stock, and there's very little drone at highway speeds; sacrifices are made. SO that's one of the reasons they are engineered at a smaller diameter. You can buy 3" for tubo cars since the turbo is going to act like a silencer.
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