FI (Frequency Intelligent) exhaust diameter?

[FSUZ33]

3" cat-back, dual, x-pipe, no muffler...choice of resonated or non & tips:
https://rae-motorsports.com/collect...z-3-dual-exit-catback-no-muffler-no-resonator

 

[NocturnalEmber]

I am confused as to what you think sub 3” will do or not do for you?
Also. Check out AAM. They have a true duel 3” you may not have seen.

I'd prefer to have the potential future headroom. I am looking at AAM currently, its on my list with Soho. Being valved has it high up on the list, though I need to look into more sound clips.

 

[NocturnalEmber]

3" cat-back, dual, x-pipe, no muffler...choice of resonated or non & tips:
https://rae-motorsports.com/collect...z-3-dual-exit-catback-no-muffler-no-resonator

I came across Rae Motorsports during my search as well. Always down to support a small business but they didn't have any images of the y pipe section, sound clips, or burnt tips available and without mufflers I'm thinking it might be louder than I'd want.

 

[FSUZ33]

I came across Rae Motorsports during my search as well. Always down to support a small business but they didn't have any images of the y pipe section, sound clips, or burnt tips available and without mufflers I'm thinking it might be louder than I'd want.

Agreed. I looked for sound clips before i posted and came up empty.
Sound clips are key, especially since there are so few out there to hear in person.

 

[NocturnalEmber]

Agreed. I looked for sound clips before i posted and came up empty.
Sound clips are key, especially since there are so few out there to hear in person.

Noticed you are from FL, what part? (I'm in CFL myself.)

But in regards to the sound: Yeah I can't pull the trigger on a $2-$3,000 exhaust system without hearing it, even then I have to take the audio with a grain of salt sometimes. As cameras have gotten better it's been less and less of an issue, though. (480i clamshell phone recordings on youtube, oh the days.)

 

[FSUZ33]

Noticed you are from FL, what part? (I'm in CFL myself.)

Tallahassee

 

[kevinbonds]

I’ve built a few high-horsepower cars over the years, and I’ve never found the exhaust system to be the limiting factor. On my 2011 Shelby GT500, I was making 750 rwhp using the stock 2.75" piping with the factory catalytic converters still in place.

For the VR, anything with a 2.5" outer diameter is more than enough. The further you get from the turbo, the less critical pipe diameter becomes. Personally, I’m going with the Remark Y-pipe, resonated midpipe, and the stock AT exhaust. That setup provides more flow than the VR will ever need—unless you’ve built the engine.

I also really like the sound of the stock AT exhaust, and it flows well. The Remark Y-pipe starts at 2.5", merges to 3", then runs into a true dual 2.5" midpipe. This is the setup that works for me, and once I get the car broken in properly, I will be moving this set up most likely.

 

[VR30Infection]

I’ve built a few high-horsepower cars over the years, and I’ve never found the exhaust system to be the limiting factor. On my 2011 Shelby GT500, I was making 750 rwhp using the stock 2.75" piping with the factory catalytic converters still in place.

For the VR, anything with a 2.5" outer diameter is more than enough. The further you get from the turbo, the less critical pipe diameter becomes. Personally, I’m going with the Remark Y-pipe, resonated midpipe, and the stock AT exhaust. That setup provides more flow than the VR will ever need—unless you’ve built the engine.

I also really like the sound of the stock AT exhaust, and it flows well. The Remark Y-pipe starts at 2.5", merges to 3", then runs into a true dual 2.5" midpipe. This is the setup that works for me, and once I get the car broken in properly, I will be moving this set up most likely.

This is one of the setups I am contemplating as well. The only issue I have is paying a bunch for a factory take off. I also might go with the Z1 Y pipe with resonator to hopefully insure there will be no drone.
I have been trying to get others to understand exactly what you’re saying. I’ve explained on other threads. The most important place to open the exhaust up is directly after the turbo. If you don’t have full 3” downpipes, then the rest of the exhaust being 3” REALLY won’t help at all. In fact a single 3” after the y is all that is needed to make really good numbers. This info came from an Ecuteck tuner that has been in the business of tuning Nissan for a long time. Duel 2.5 or single 3 or a combo of the 2 is really all that is needed. Even with the bigger Z1 turbos that make over 700hp with this type of setup. With large pipe you’re not increasing flow, you’re just reducing exhaust velocity. If there was a company making duel 4” exhaust there would be a bunch of people buying it thinking they will free up even more power. Lol

 

[NocturnalEmber]

This is one of the setups I am contemplating as well. The only issue I have is paying a bunch for a factory take off. I also might go with the Z1 Y pipe with resonator to hopefully insure there will be no drone.
I have been trying to get others to understand exactly what you’re saying. I’ve explained on other threads. The most important place to open the exhaust up is directly after the turbo. If you don’t have full 3” downpipes, then the rest of the exhaust being 3” REALLY won’t help at all. In fact a single 3” after the y is all that is needed to make really good numbers. This info came from an Ecuteck tuner that has been in the business of tuning Nissan for a long time. Duel 2.5 or single 3 or a combo of the 2 is really all that is needed. Even with the bigger Z1 turbos that make over 700hp with this type of setup. With large pipe you’re not increasing flow, you’re just reducing exhaust velocity. If there was a company making duel 4” exhaust there would be a bunch of people buying it thinking they will free up even more power. Lol

There's certainly a point of diminishing returns when it comes to larger diameter piping. I'm assuming that anyone buying an exhaust from a performance standpoint would have at least 3" downpipes in mind, though.

past that, yeah as exhaust cools the diameter becomes less of a concern, thats just thermodynamics at work. My mindset on my search, though, is that if I'm going to do it, I'd rather do it once and get what I'm looking for while also having the headroom for a large hp build down the road, including building the engine, so for my goals it makes sense.

For the vast majority though? Well, I guess its all a matter of preference, if you like/want it, then you like/want it.

 

[kevinbonds]

There's certainly a point of diminishing returns when it comes to larger diameter piping. I'm assuming that anyone buying an exhaust from a performance standpoint would have at least 3" downpipes in mind, though.

past that, yeah as exhaust cools the diameter becomes less of a concern, thats just thermodynamics at work. My mindset on my search, though, is that if I'm going to do it, I'd rather do it once and get what I'm looking for while also having the headroom for a large hp build down the road, including building the engine, so for my goals it makes sense.

For the vast majority though? Well, I guess its all a matter of preference, if you like/want it, then you like/want it.

I can understand your points, but I don't think you can make enough power in a VR30, even after it's built to surpass the flow of a dual 2.5 OD piping. Everyone's goals are different but if we are talking a built motor and large turbo, you are looking at 20-25 investment minimum, so redoing the exhaust later is a small expense if you need to. If it were me, I would do a full DP, into dual 2.5s and call it a day. You may get allot of drone without a resonator. At the end of the day it's up to you, but if you plan to drive the car, for a while before the big turbo and engine build, you may want it to be fun and sound good for the meantime while you're waiting to upgrade.

 

[NocturnalEmber]

I can understand your points, but I don't think you can make enough power in a VR30, even after it's built to surpass the flow of a dual 2.5 OD piping. Everyone's goals are different but if we are talking a built motor and large turbo, you are looking at 20-25 investment minimum, so redoing the exhaust later is a small expense if you need to. If it were me, I would do a full DP, into dual 2.5s and call it a day. You may get allot of drone without a resonator. At the end of the day it's up to you, but if you plan to drive the car, for a while before the big turbo and engine build, you may want it to be fun and sound good for the meantime while you're waiting to upgrade.

Its not so much the expense as I wanting to find the right one for me without going through multiple removals/installs. Some may consider it trivial but for me its just an annoyance I don't want to deal with if I don't have to.

Typically I don't run into issues finding an exhaust, but even the ones that check all the boxes are surprisingly lacking in other areas. Case in point, the AAM valved exhaust looks like a great potential candidate, but they have absolutely no audio clips of it.

I might be being pedantic here (though I don't think I am), but if I'm paying $3,000 for an exhaust, I'd prefer to know what it sounds like ahead of time.

 

[kevinbonds]

Its not so much the expense as I wanting to find the right one for me without going through multiple removals/installs. Some may consider it trivial but for me its just an annoyance I don't want to deal with if I don't have to.

Typically I don't run into issues finding an exhaust, but even the ones that check all the boxes are surprisingly lacking in other areas. Case in point, the AAM valved exhaust looks like a great potential candidate, but they have absolutely no audio clips of it.

I might be being pedantic here (though I don't think I am), but if I'm paying $3,000 for an exhaust, I'd prefer to know what it sounds like ahead of time.

You may be overthinking it, v6 turbo cars can be a challenge to get a good exhaust sound. In my opinion, the main goal is to avoid drone when cruising and that 2-3k low rpm raspy sound. There are allot of good options on the $1500 range that are from the cat back and worst case, if you don’t like it, can always resell it and get
Most of you money back.

 

[NocturnalEmber]

You may be overthinking it, v6 turbo cars can be a challenge to get a good exhaust sound. In my opinion, the main goal is to avoid drone when cruising and that 2-3k low rpm raspy sound. There are allot of good options on the $1500 range that are from the cat back and worst case, if you don’t like it, can always resell it and get
Most of you money back.

I'm aware of the issues; my problem is finding one that I feel is a good fit. I've already dealt with taking one exhaust off of the car already, its not something I care to go through multiple times if its not necessary.

 

[VR30Infection]

I don’t think you’re pointed in the wrong direction at all. A lot of your concerns are literally why I haven’t pulled the trigger on one as well. I want it to sound unique and strong. I don’t mind gurgle and rasp when driving aggressively but any drone during cruising is unacceptable to me.

 

[NocturnalEmber]

I don’t think you’re pointed in the wrong direction at all. A lot of your concerns are literally why I haven’t pulled the trigger on one as well. I want it to sound unique and strong. I don’t mind gurgle and rasp when driving aggressively but any drone during cruising is unacceptable to me.

Yeah, drone is an automatic no as I drive the car daily.