Jump to content
SAU Community

Recommended Posts

Hello everyone! 
 

I am posting for the first time here, so feel free to correct my post selection/delete it if needed. But, I finally picked up an R33 GT-R a few months ago and I am absolutely loving it! I got the itch to start installing some parts of my own on it (it by all means was not stock when I got it though). I’m mainly talking about the exhaust here and I haven’t been able to find any information on this subject.

The car came with a true dual exhaust and I haven’t been able to find a brand name on it, I doubt it’s a Kakimoto which seemed to be the major dual exhaust brand for it back in the day. And my questions are: 

1. What are the pros to a true dual exhaust on the twin turbos?

2. What are the cons to a true dual exhaust on  the twin turbos? 

3. Is there major boost creep issues on this the car if I get rid of the cats? (I don’t need them where I live)? 

4. should I go with a single exhaust from the front pipe all the way back? 
 

Link to comment
https://www.sau.com.au/forums/topic/486051-dual-exhaust-questions/
Share on other sites

1. There are no real performance benefits. It sounds different, and as the pipes are not as large diameter you can claw back some undercar clearance or run lower (if that's your thing).

2. Twin pipes, offering exactly the same cross sectional area as a single pipe** will have higher pressure drop - so will not flow as well. That's because there is more surface area of wall per cross sectional pipe area, hence more frictional losses.

** But of course, it is almost impossible to get 2 pipes that are exactly the same XS area as a given typical single pipe. eg, 2x2" is not the same as 1x 3", although it is close. If the 2x pipes add up to less XS area than the single - it will just be flat out worse. If the 2x pipes add up to a bit more than the single, then it might come out as a wash. If the 2x pipes are substantially more XS area than the single, then it will probably flow a little better.

3. No. Why would there be? What have cats got to do with boost creep?***

***But for f**ks' sake, please run a cat.

4. If you want.

  • Like 1
6 hours ago, Dose Pipe Sutututu said:

It will sound tragic and you wished you didn't have 1x exhaust per turbo.

There's a reason why most S55 owners change to a single mid pipe.

The car doesn’t sound bad at all right now, it just doesn’t sound a good as I’d like it. 

On 1/10/2025 at 6:15 PM, LoweSpeed said:

Hello everyone! 
 

I am posting for the first time here, so feel free to correct my post selection/delete it if needed. But, I finally picked up an R33 GT-R a few months ago and I am absolutely loving it! I got the itch to start installing some parts of my own on it (it by all means was not stock when I got it though). I’m mainly talking about the exhaust here and I haven’t been able to find any information on this subject.

The car came with a true dual exhaust and I haven’t been able to find a brand name on it, I doubt it’s a Kakimoto which seemed to be the major dual exhaust brand for it back in the day. And my questions are: 

1. What are the pros to a true dual exhaust on the twin turbos?

2. What are the cons to a true dual exhaust on  the twin turbos? 

3. Is there major boost creep issues on this the car if I get rid of the cats? (I don’t need them where I live)? 

4. should I go with a single exhaust from the front pipe all the way back? 
 

There aren't boost creep issues, it's not engineered around the restriction of the cats but if you haven't tuned the engine a full decat + exhaust can flow enough air to run off the end of the OEM load scales and you will get a pretty substantial reduction in ignition timing as a result. I recommend using DFCO, avoiding ignition cut limiters, and avoiding popcorn tunes along with running a cat unless you enjoy a perpetually soot-covered and potentially burnt bumper.

Edited by joshuaho96
  • Like 1

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • That is surely the biggest gathering of Stageas in North America, ever!
    • Remember kids - if you can't afford to buy 2 GTRs......
    • I know people cry at the price of the Getrag 12-14k for a conversion now, but it really is a nice mid point. Not going to get change from 10k on a gearset installed.  $30k++ for sequential.   I know you run the risk of a damaged used one and parts are hard to get but as a street car gearbox its really hard to beat. If you enjoy a more traditional manual, its the choice no question.     
    • Time to decide what’s more import, your power level or your budget because you’re going to struggle to keep both 
    • Our Southern Highlands Cruise is proudly registered with “R U OK?” Day.  Sometimes the best way to check in on your mates is by getting out for a drive together. Sharing a common passion like cars creates the perfect space to chat, connect, and support each other.  A simple “R U OK?” can make all the difference. Let's enjoy the drive, the company, and look out for one another. PLEASE WEAR YELLOW FOR “R U OK?” DAY Sunday 14th September 2025 9:30AM Meeting Crossroads Homemaker Centre 10:00AM Cruise Departure Via Old Hume Hwy 11:45AM Arrival at Mittagong RSL Club Meet Location: Crossroads Homemaker Centre Final Destination: Mittagong RSL Club *Disclaimer* There will be a lead and follow car so no one should get lost. If you would like to attend or bring others along please put your name down and a +1 as numbers will be needed prior! This is NOT a race and we will all be adhering to all road rules. If this is what you want please come to one of our many track days. This is an official SAU:NSW event and will be run under a CAMS permit. One of the things that really sets our club apart is our commitment to being true enthusiasts. When on normal roads we strive to maintain good relations with the authorities as well as the public in general. When attending one of Skylines Australia NSW events please try to: • Be aware of surrounding environment and act accordingly. • Drive courteously on the state’s roads as a true enthusiast should. • Understand how important it is to maintain the good name of SAU NSW and thus, treat others accordingly. • Any misbehavior will not be tolerated and you will be asked to leave.
×
×
  • Create New...